Yogi would be a seriously nice upgrade over Mason. He got moved off-ball last year which hurt is playmaking opportunities, but he's a pretty good passer. He's a really great spot-up shooter, doesn't turn the ball over and he can play the 1 and 2 so there's a nice fit there with Fox in certain LU's.
His defensive on/off is kinda stupid ridiculous too last season. Mavs were 9 !!!!!! points better with him on the floor than with him off. I almost wonder if that's a mistake or if Yogi's sub was just that horrible last year. He was also 9th in DRPM last year for PGs which is actually sort of surprising. So maybe there's something to the defense.
Regardless, this would be a good pick-up. Adds good shooting and a back-up playmaker who can play on or off ball. I'm for it. Bjelica/Yogi/Nwaba?? to finish out the bench would actually be a good off-season and 3 nice upgrades on the bench. I'm about it.