Abhishek may never play tests. So can't compare there. There is no real incentive in honing his test skills now that he is set for 10 years in the IPL.
He was an all rounder when he started. Then he became an opener. Became classic batsman with sound technique. Then went to Yuvraj along with Gill to master the art of hitting sixes. Gill did not lose his batting base. But Abhishek became a completely changed player. Both are buddies as they both were part of 2018 under-19 world cup team.