Lol, there aren't even that many notches. There are essentially three tiers for batsman averaging 45+ in tests, four if you consider Bradman a tier unto his own. At the top you have the Tendulkars, Laras, Viv Richards of the world. Then there are the likes of Dravid, Sangakkara, YK etc. and finally you have the lowest tier for batsmen like Jayawardane, Laxman, Inzamam and Yousuf. The use of sheer volume of runs is a conflict in our methodology because in India, that is actually used as a measure of a player's caliber. In Pakistan, we use averages(Shahid Afridi is an exception because his averages don't support what people want to prove). YK would naturally have fewer runs than Dravid overseas since he has played 65 matches fewer than Dravid in England, Australia, NZ and SA(25 vs 90) but both average about the same (45.8 vs 46.5), score 50+ at the same rate(1 every 3.5 innings vs 1 every 3.4). Both have won about the same percentage of games (24% and 28.8%) but YK's 90 odd average clears Dravid's 59. All said and done, while Dravid may be marginally better, there's no way he's entire notches above YK. At best, he's situationally better by a slight margin.
There's a reason I didn't bring up ODI performances because if you read my posts in this thread from the beginning, it's clear I'm concerned specifically in tests. When you use the generic term 'batsman', I automatically jump to tests. In my book, a batsman is defined first and foremost by tests. ODIs are secondary. That said, Inzamam is undoubtedly a much better ODI batsman than YK but YK is an entire tier above him in tests(as opposed to Dravid and YK who are generally in the same tier in my book). I don't see where you get the notion that YK hasn't done well in Australia considering he's only played one series there which was against McGrath, Warne and Gillespie, and he ended that series with an average of 43 and four scores of 40+ in six innings. This series was played in 2004, before YK became the YK we know today(that transformation started a year later). Inzamam playing in England in the 90s is no different to YK playing RSA in the 2000s, well after they stopped their 90s policy of making placid tracks for Pakistan tours and Steyn+Philander+Morkel>Donald+Pollock. Besides, England's bowling attack in the 90s was so rubbish that they essentially took the pitch out of the equation. Refer to the 1996 tour of England to see how hard England was in the 90s and compare that with the 2016 tour.
Yousuf isn't even in the same league as YK so a comparison there is just pointless.