While I don't want to spoil the Pecco-bashing party, I can think of a few examples of more unsuccessful double digit GP winners in the 4 stroke era. Starting with Pedrosa who's the prime example of guy who won lots of races but never the big prize. And then you have a few others like Viñales (double digit GP winner, can you believe it?), Dovizioso, hell, even another champion like Quartararo fits the bill and he could end up not winning a race ever again.
I'm lukewarm towards Pecco, I share the usual criticisms leveled towards him (error prone, always blames external factors, Rossi connection, hasn't been seriously tested until now) but he can still make us look silly after this weekend. I think Martín will win this year's trophy and it will be deserved, but I don't think Pecco will be thought of as a bum upon retirement.