The reason I say key injuries is they are all outside backs, and Frurean and Ngatai are quite experienced players and have a lot to offer and Lowe is a real promising up and comer.
Yes they can all be replaced from the WTS easily but it will only take 1 more injury to someone like
Mils Muliaina
Tim Nanai-Williams
Gareth Anscombe
Asaeli Tikoirotuma
and that outside backs ranks may start to look a little thin.
The Chiefs are very damaging on the flanks attacking from out own 22 with ease, that is based around those outside backs being there to deliver, if we lose that we lose a key factor of our game, while I don't doubt our ability to deliver without them it will be a **** load harder and may be the difference in a few wins.