It was Pro Style, it just was a different kind of Pro Style, but you have to remember back then the game was a lot different than it is now. The rules were different & the way in which offense was approached was completely different.
Gary Stevens & Bon Bratkowski were two very good Pro Style OC's who utilized the passing game in an era when Football was all about the Run game.
Coach Erickson was a great offensive mind for his time, before he came to Miami he was in places like San Jose St, Wyoming & Wash St where he developed his offense that was very cutting edge for its time which was right around the same time that Bill Walsh was developing the West Coast Offense at Stanford & San Fran with Mike Holmgren & Andy Reid.
Erickson was with Jack Elway (John's Dad) at San Jose St & at Fresno St, John Elway was running the very first Spread offense in High School at Granada Hills & when Erickson was at San Jose St as an OC he learned the One Back Spread from Cactus Jack Neumeier himself, that's why our Offenses looked like that with him as HC.
Since then, we've never run anything close to it, we've been nothing but Pro Style & while it worked through most of the 90's & early 00's, as the game exploded & expanded dozens of other teams evened the playing field & closed the talent gap by giving themselves a schematic advantage by continuing to develop & implement the Modern Spread offenses. We didn't, we got left behind & now we're actually behind the times...
The Pro Style offense still works, IF YOU HAVE THE PERSONNEL TO RUN IT. We don't & haven't had the personnel to run the Pro style since 02, but we simply refuse to adapt & adjust, and as the saying goes those who don't adapt, die.