I think the issue is about how many changes we have to make.
We've already had to bring in O'Hare's back-up, which has weakened us but you'd hope we'd still be able to be competitive if that was the only change we had to make.
The bring problems come with if we have to bring in more of the back-up's, which will have a multiplier effect IMO. Basically think of it like as an OR/AND. If O'Hare or Gyokeres or Hamer are out, it's bad but should be manageable. If O'Hare and Gyokeres and Hamer are out then the effect of that is going to be way more than losing them at separate times.
Some people are arguing that the and scenario is likely to happen, others don't think it will. At this moment O'Hare may be out for a lengthy spell, he may not, there is the distinct possibility one of Hamer or Gyo being sold (probably Gyo) which would be two, and if we keep Hamer it's highly likely he will be missing a couple of games here and there with suspension, which will impact us at that time.
Right now it's impossible to say until the severity of O'Hare's injury is known and the transfer window has closed. Hamer being suspended I'll take as a given.