well he was with SET the entirety of last year, and was with SIUX before them for about 2 years. Before Siux he was with HEAD for like... 8 years or so? That's the entirety of his racquet brand changes lol... he began this season with Starvie, probably didn't love Set given it's a small brand. His partners however, everyone below the top 16 are subject to constant changes because every time teams higher in the rankings part ways there's a ripple effect that trickles downwards. If his partner gets an offer from a higher ranked player, he can't help them leaving him.