Not bad but wow, the old party was chaotic, made a deal with him that if he didn't unlock the advanced job he was fired, he didn't and they fire him, he tries to lick their shoes to stay in the party, they laugh at him but even declare how he is limiting them and in the end leave in a "friendly" way, then he discover they stole money he should have got from the guild because his job situation gave precious information, at the same time they were going around with someone that wasn't much help so we could think they were taking the money as fee (we don't know how much a million is in that world), then he discovers that he wasn't a bad adventurer and gave real good support and the old party lied to him about his abilities so that he would stay and not leave for another.
So the old party looks like the usual, cliche group of bastards that use a MC all they can but with some more thought into this, well, is unlikely he will meet them again soon as they left.