Is Calvillo CFL’s greatest QB?

That would depend..

If I was a businessman and owned the team, I'll take a great player for many years.

If I didn't care about rebuilding the team in the near future, and wished to win today, I'll take the god.

Short answer, NO.
However he owes his career stats to his receiving core & MOST importantly his O-lines over the years in Montreal.

He still has the silly feet he had in Hamilton if that O-Line lets him down ..... hence why I say no.