Look at how many decades it took Shatner to get that Emmy.
What's Nimoy's excuse, he had a more lucrative career than Shats.
Why did Shatner appologize a few years ago to all his cast mates of TOS for stepping on their toes and cutting down their parts? Being a star of a show doesn't grant you the right to be a big shot. TOS wasn't even a top rated show and he was still throwing his weight around.
If that is in fact true, then it was about an inflated ego.
Frankly if you weren't on the set or good friends of either man, nobody here has the "real story".