Remember megaman X5 and X6

Yes, but Dr. Light said "If he isn't fixed soon."

For all we know Dr. Cain might have serverly upgraded him if or when he went offline.

Before Dr.Cain developed reploids in the X era, he was an archaeologist who discovered the remains of many reploid battles in the original series. He found megaman and made a giant reploid culture made based on Megaman's design.

In the quote that Dynamo said in the Megaman X games however, he mentioned" I am the coolest and wisest of all", boasting about his theoretical years of experience of fighting and being wise thus proving he has lived a very very long time.

a) iirc, Protoman refused treatment from Dr. Light.
b) Where are you getting that he discovered robots other than X?
c) That's Dynamo being an arrogant pimento. Even if it wasn't, a quote like that would be closer to supporting that he IS Protoman, instead of being based off him.