The account that was recruited can grant the account that recruited it 1 lvl for every 2 gained starting when the accounts were linked. So his main account recruited an alt account. He joined the accounts... and then lvled up toons on his alt account. Made a panda, and granted his panda 40lvls from one of his 80s on the alt account.. then logged a different fresh 80 to grant another 40lvls.
edit: actually I think the level granting can go in either direction.