A few teams left him for marina this year, Tobias/Tkachenko (even if they ended up not competing), Lorenz/Polizoakis at the end of last season, and then Lewis/Bye mis-season...
AFAIK Igor still has Chock/Bates, Nazarova/Nikitin, Min/Gamelin, Coomes/Buckland, Pogrebinsky/Benoit, Abachkina/Thauron for seniors. Carreira/Ponomarenko, Nguyen/Kolesnik for juniors.
Igor also has Mansour/Ceska who qualified for Olympics.
Igor's rink was indeed too crowded at one point compared to Marina's. The switches produced a sort of rebalancing.
Tobias-Polizoakis-Lewis are also very close friends.