No. He was the opposite of any threat to them. If you think of the Mullah’s like a head, the Quds Force general was part of their eyes, their ears, their arms and their legs. The Mullahs are not suicidal and he was not vying to replace them or be over them - he was in lock step with them on all they jointly sought to do.
But Iran can no longer afford these proxies he commanded.
They work for money and Iran’s broke.
Of course, they couldn’t remove the hero themselves.
Anyway, I think this is worth consideration. Though likely peripheral even if true.
Stalin had a lot of his generals murdered or sent to the Gulag, and they appeared to be nothing but loyal to the regime and the country. One never knows about the machinations going on behind the scenes, or about who has gone over the edge with paranoia.