Re: Isa (AS), Quran and his second coming:
Funny you should say that. This is exactly the logic I’d use to argue my case. You are the one who’s arguing that the best ummah is really not capable of attaining the highest spiritual reward that’s promised in the Quran.
And this is still a conjecture on your part that “Isa (AS) will not maintain the prophethood”. I’d rather believe Prophet Muhammad (SAW)'s word when he calls Jesus (AS) a prophet.