Could it be something to do with the price tag if any involved
you know we sell a player on for x thousand, he comes back for whatever reason, and then the crowd are baying for blood as soon as he makes a mistake as "he must be good as we got £xx for him" so the player in question is in the spotlight sooner.
whereas with allot, 99% of the fanbase thought he was , so wrote him off before he came, turns out he is not so bad this could be due to the pressure being off him from day one as he has been written off?