If it was removed, then I don't know, but I paid attention to my helpers (I weed out quite often during the first few days). Their highest level was always the same as my highest level. I noticed this because the early levels are blazing fast (remember to spam those gathers), it was too much of an coincidence that everyone on my list leveled up in sync with me. This might've been a way to prevent powerleveling alts with a main account.