Clearly you agree that he deserves consideration, since you've devoted multiple paragraphs in this thread to considering him for the purpose of slagging him off? 😃
I believe your assessment of Vieira vs Cesc isn't grounded in their individual qualities, it's based on the fact that Vieira won a few trophies. Well he played alongside Henry, Bergkamp, Campbell, Gilberto, Pires, Ljungberg and Seaman, left off a few names no doubt - and that's the main reason he won the trophies.
The rest is retrospectively tweaking the parameters of your rhetoric regarding the respective manners of their departure in order to fit your gut feeling ...
I wouldn't propose Fabregas in a first XI of PL history but that's neither here nor there in my rejection of such dubious vitriol.