Thank you for the explanation which is rather tangential to the central points that there are no decent off spinners in Pakistan right now that can bowl with a clean action and enter the international fray as ready replacements for Ajmal or Hafeez.
Saqlain Mushtaq has basically lamented the fact that there is no off spinning coach to develop this crucial art and the bowlers he came across in 2014-15 alongside Ajmal were all kinked. This clearly only points to one thing that our off spin bowlers cannot develop in F.C. without massive injection of resources in coaching and testing at the LUMS. Whether this money is spent on an individual or a set of individuals is besides the point. Really what we need is to develop decent world class off spinner below the age of 30 unlike the two guys you listed above.
Hafeez slips through that age bracket because hes a world class all rounder and the money spent on him is actually bound to be less than in the past because lums I think has icc accreditation now but I could be wrong. Either way he doesnt need to travel to another centre every month.
I think, more than coaching the biggest problem is FC cricket. Spinners are developed through longer format and bowling for long, long spells. These 250 overs FC game on sluggish, soft green tops are worst for developing spinners (& batsmen to play spin as well). There was no LUMS when Tauseef, Saq or Arshad used to bowl and they had cleanest of actions - even part-timers like Sohaib Md., Salim Malik had perfectly clean action. There were couple more guys - Sazzad Akbar (?) & Akram Raza, may be Akram was slightly question mark, but still better than even Malik. So, it can't be bio-mechanics or coaching only.
I for someone never judge spinners on 15 degree testing, just from action almost always I can tell what he is doing. For example, take MoHa - I for someone walk on a very thin ice on my "strong" comments on PAK cricket; one slip & there are many here, who'll pull down underwear ........ still, you can check, I was firm, bold & point blank straight on what MoHa was doing in 1st ODI. Even that time he wasn't called .... by the time he was called, I called then and then that this 8-0 won't be a proud memory, because I was damn sure if ICC forces him to repeat his deliberate chucking, no way he'll bowl in Internationals. I don't know the test results, but if published, you'll see some of his balls were over 35 degree, even close to 45 degree.
I know exactly from when PAK finger spinners started to walk on the wrong path and why. From classical off-spin action - it's the most fluent & easiest action - anyone, even girls can bowl off spin with a clear action. Don't get upset by the girl comment because there is a bio-mechanics behind it - ask any girl (I presume you are not female) to throw a ball - most of them'll do it from shoulders (straight arm), boys will throw from elbow - that was the beginning of round arm modern bowling action some 200 years back. When bob joined PAK team, he brought his English philosophy for spinners (I explained many times) - that actually forced spinners to bowl faster & on tight spot - that was the time when one by one many PAK finger spinner I was started to dart; bowl fastish cutters from elbow and 3/4 of them actually were called, including a fantastic U19 kid - Tariq Mahmood.
Regarding MoHa's perceived value, the part that you all are missing is that he was a 23/58 stats batsman for his first 6-7 years, whose chucking made him regular in XI & PAK playing most matches in UAE/Asia against sub-standard teams made him World Class for his bowling, more than bating. Even in his hay days, he had stats like 25/65 outside Asia (when he was like 50/85 in Asia) - take out his life time achievement in Mughabe's ZIM, that figure'll come down to 20/60 level. Take out his illegal bowling, he is 50+/5.5+ bowler - that's in Asia. These guy is cunning & Sarfraz obliged - allowed him to make numbers against this hapless SRL side, that too by deliberate chucking on sluggish UAE wickets. I'll bet at any stake - number of overs altered between MoHa & Malik against this SRL side with God knows, probably 6/7 lefti in it - Malik's figure with authentic action will be better than MoHa's half legal figures.
LUMS won't correct anything, because he chucks deliberately - if you don't accept that, fair enough. PCB was ready to play him in a WC in AUS, AS SPECIALIST BAT, where before 2017, his career stats for 6 innings was 12.75 average at 48 SR (after 2017 still it's 18/58

); so here they'll invest on a 40+ morally corrupt, bang average player - no surprise in that.