I think 12 of the starting 15 were involved in an A game over the summer. It's a decent enough side but the ABXV seems stronger than the MAB.
Actually I don't think the ABXV is stronger than the maori all blacks.
For instance, Maori all blacks had lomax, Harmon, weber who are now with the all blacks squad; grace, zarn Sullivan who are injured but otherwise would probably be in the ABXV; Delaney, proctor who should probably be in this side but the powers that be wanted to develop some other players.
The ABXV is, similar to what the maori all blacks were, a team comprised of players not in the all blacks squad, the exception being Roger tuivasa-sheck (who, while in the all blacks squad, isn't so in merit - he is a development player) and Brayden ennor who have been released from the all blacks. The maori all blacks were restricted to players who have some maori blood, but was otherwise the best players available (although they gave their whole, small, squad a run over the two games). The ABXV doesn't have the same restriction but also isn't the best players available - it is a mix between players who are the next cab off the rank for the all blacks, and inexperienced players who have been picked for development purposes. Dev Players like Gallagher, Gardner, Leo-willie, and Brewis wouldn't have made the maori all blacks if eligible