stripped driveshaft?

removing the outdrive i have done, i just haven't done anything except replace the impeller/water pump/bellows as a preventative measure when i bought the boat last year. would a spun hub cause the throttle not to click into gear, and no bubbles out the prop housing? i hope it's the hub, but would that make sense given the other symptoms? how would i check it? should the prop spin freely by hand or not? thanks for the help.