Had they met in their respective primes[I think Graziano was,] would there have been any need/demand for a trilogy?].
Probably not, given Tony Zale's very good if not great skill set to go with his awesome punching power. From a style wise perspective a fight between Zale vs Rocky Graziano always looks like a fun fight to watch on paper, almost to the same extent of Gatti-Ward. Now Prime Tony Zale vs either prime Jake LaMatta or prime Sugar Ray Robinson are two fights that I feel would have been worth PPV/CCT money to go and see.
Zale was a complete fighter back in his pre-war prime - just look @ the footwork & defensive skill he displayed vs. Hostak: This content is protected Post-war Zale still had his power, but by comparison, his feet looked like they were stuck in mud: This content is protected