As absurd as it sounds, 700 from Gawn is literally just getting fair value on the investment. To go anywhere near the rookies production he'd have to be putting up probably 180 a week and even that's assuming the rookies only manage 63 for the 124k guys or 59 for Hunter which seems on the low end of reasonable outcomes from them.
Captaincy is a factor but even then at 140 a week he's going to get you 100 points in that period over someone taking 120 each week while Hunter scoring 65 is going to generate 230 points above his value, way ahead even with captaincy in the equation.
Gawn's absolute score only truly matters when sides are finished, until that point the relative value of the points moves the needle more. It's the same reason a 350k guy can be a keeper while scoring less than a 550k starting pick. Economics 101, allocation of finite resources