18 months ago Laporte cost City £57m.
Some would say he is in top 10 in the world
He is the same age as Bailly and granted has not got the same injury record, but statistically you can see Bailly might be underrated
Per game
Tackles
Bailly (B) 1.3
Laporte (L) 1.2
Interceptions
B & L 1.1
Fouls
B 0.4
L 0.6
Clearances
B 3.1
L 2.7
Blocks
B&L 0.3
Bad control
B 0.4
L 0.3
Dispossed
B&L 0.1 each
Dribbles
B 0.3
L 0.1
Key Passes
B 0
L 0.4
Passing accuracy
B 87.1
L 92.3
Passes per game
B 25.2
L 85.6
Long Balls
B 1.6
L 4.9
Yellows
B 0
L 0.1
Red
B 0.1
L 0
In summary, Bailly looks a marginally better defender, but not as good at passing or providing long ball options, but hard to read into that given the possession based game of City so more of the passes are probably low risk and the long balls to high energy wingers.
This is based off a relatively small sample of games for Bailly, so hard to read into it, but i do think the potential is there. If he can avoid injury and keep discipline he could be a useful asset.