On the other hand, players who fought for their place like Sturridge and even Origi, wow, what a reward.
If coutinho had performed at his best in Barcelona, he would not have be sold/loaned in the transfer window and he would have definitely won the champions league with Barcelona someday soon. As for Emery can I do not think Liverpool were actually interested in keeping him. So the success of the team a player leaves shouldn't actually bother such player or make him feel bad, as he could still get more success in his current team.
Players like sturridge and Origi played peripheral roles in Liverpool winning the title, I doubt if history would remember them so much for it.