Whis states it right after the explosion happens (In Dragon Ball Super (And probably the movie too.)). He probably didn't know that everyone survived and that Whis could make a protective bubble like that. Come on man, read inbetween the lines.
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He says he is most likely alive but he doesn't know for sure. Vegeta can sense ki, so he would have known they survived if he was alive.
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Dude, you're literally grasping at straws now. :/
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No I'm not. If Vegeta was alive he could have simply flown to the others given how he is ftl.