His speed and eye for a goal although not proven at league level.
I look at Wellens promotion winning side along with Plymouth, Exeter & Crewe and it was head and shoulders above what we’ve got now and proves how poor the quality is in league 2
Wellens took the approach to spend the money on 14-15 players and concentrate the quality. Which largely worked, though we did have a number of short term emergency CB's at one point.
Holloway has gone with the 2 players for every position and to stack and rack his forwards. Lower individual quality but more depth and options.
Wellens approach was risky but worked.