Is the possibility of adequate replacement feasible? Sometime the answer to that question is NO, but still a good move... as in 'cap' considerations.
I'm like you regarding Quinn... I agree his hit in $ was an issue... but I also don't think there is a wealth of players out there that can be as good... and the chances of getting one is certainly not out of the question but at the same time no sure thing.
That said, completely disagree with you regarding Donald. Not sure you can come up with a 'feasible' number of additions that would equate to his worth. - JamesJM