In my opinion IMG took us into BC much too early last year (April 4) and we ended up waiting around for weeks because the icefall wasn’t setup.  Some people even went and climbed Island Peak after settling into BC.  This year we arrived into BC around April 12 and this was much better.  A week or so resting and then we moved up.  Really not sure why IMG get to BC so early, when everyone else comes in 10+ days later – perhaps it makes it easier logistically to get stuff in before the crowds.  But why make the members come in so early?  The more time you spend up high, the weaker you get.  Yes, you need to acclimatise, but too much is not good.  It could be that was why there was more sickness?