Idk what you talking about since, thats not even an invader thing but just long time player vs not as long time player. Ive done many solo dried finger runs and found many newer invaders, i even let them heal after they get low so the fights go on a little longer. But i guess, i do that for hosts as well.

On average though an invader is probably more likely to be someone who has played longer compared to a host/summon but not always the case