Cobb played twice the amount of games, had twice the amount of targets, yet only had 18 more receptions (less than double Allison), only had 81 more yards, and the same amount of TD's.
If you'd like to look at it on a per game status:
Allison: 4/60.5/0.4 on a 66.7% catch status (that's including the Rams game where he didn't play much)
Cobb: 4.2/42.55/0.22 on a 62.3% catch status.
Looking more in depth, Cobb had one game (week 1) where he went over 45 yards. In fact, 24% of his receptions, 37% of his yards, and 50% of his TD's came from that one game. Allison was much more consistent, when healthy.
In absolutely no way, shape, or form, did Cobb have a better season than Allison did.