I think you could have made your point without this. Makes you sound petty and juvenile.
The cast of Jar Jar's, I mean J.J.'s Trek,
Shatner and Nimoy helped define Kirk and Spock. Kelly and to a lesser extend Doohan did the same for McCoy and Scott. In the hands of other actors they would have gone along a different path. Possibly a less memorable one. The rest of the cast were pretty replaceable and were replaced in several episodes with out the show skipping a beat.
The real key was chemistry. Shatner, Nimoy and Kelly had that. And I think Pine, Quinto and Urban have it too. Outside of nostalgic considerations, the folks in the movie playing Scott, Uhura, Chekov and Sulu are probably better than the originals.
IIRC, Lloyd Bridges was also considered for Kirk. Mark Lenard was a possible Spock. McCoy was written with Kelly in mind.
Landau was busy with Mission Impossible and I doubt he would consider Stonn a meaty enough role. Mostly Stonn stood there looking like a wounded puppy.