If you look at average number of draftees per year for each coach by recruiting class, not graduating class, I believe it's a substantial advantage in favor of Gailey. Recruiting has been the problem under this regime.
gaily recruited
Burnett DB Most of career under johnson
Morgan DL 1st round Most undner johnson
Thomas WR 1st round Most under Johnson
Dwyer RB Most under Johnson
1 year under johnson mostly gaily
M.Johnson DL
Gardner OL
Walker DL
Gaily Recruited and Coached
Wheeler LB
Choice RB(transfer in)
Wrotto OL
Brooks P
C Johnson God 1st Round
Landry DB
Wilkinson LB
Everyone prior was recruited befor 2002 so pre gaily
so that means that gaily only recruited and properly coached into the nfl arguably 10 players and of those 10 only 1 Calvin was first round and 2 had their best years under Wommacks' defense
Johnson recruited and coached
Butker K
Gotsis Dl 2nd round
DJ white DB
Smelter WR
Mason OL
Waller WR
Attouchu LB 2nd round
Watts LB
Thomas DB
Hill WR 2nd round
Allen (Transfer)
Johnson recruited and coached 11 players into the nfl draft, No first round picks but 3 second round picks gaily had no second rounders and only one first round pick
I do not think there is evidence to support that recruiting was better or worse under either coach. The 4 best players in recent memory not named Calvin johnson spent most of their careers under johnson so if you want to give gaily credit for them you can't give him credit for players like Daryl Smith Kearon Fox or anyone that oleary recruited which means the numbers balance out.