Because I'm in a hunting club, I know a ton of hunting Labs (the blind retrieve signals - back, angle back, over - which is fairly advanced work, indicate a hunting Lab). They're just happy boys and girls, perennial optimists and affection sponges. My older Chocolate will work her birds for ANYBODY, even a six year old kid, and circulates among the crowd trolling for pats and the occasional treat. Even my young field bred girl who is not a schmoozer will kiss anybody who'll hold still long enough.
If something were ever to happen to me, Shelley and Ruby would adapt to whatever person they wound up with, and would love them just as much and work just as hard. That's just the way Labs are. Give them food and affection and a job to do, they will be happy. Thank goodness -- I don't have to worry about them wasting away like The Dog At His Master's Grave.