He'd be very nice to have, given how poor, defensively, your existing trio is.
But while this Diamond CP3's ratings are outstanding, his badging is poor. Only one HoF badge, and only 3 others, so can only carry 10 total badges. Has Floor General, at least, but nothing else useful. A good Diamond should have 2 or 3 good personality badges, and 2 or 3 HoF badges, and room to hold 15 or more regular badges.
And even if badging is something you can overlook, he's only 6'0" and his Shot Contest is not great, at 82. And his shot is on the slower side. So his strengths in defense and shooting are both compromised, from my perspective.
I'm pretty sure I'd rather use Diamond Jason Kidd:
http://2kmtcentral.com/17/players/compare/8036/20166