Looking at it from the other angle (As I occasionally do
) the hard times on the field could also be the source of frustration and discontent.
We've all been in situations in work where two people, working towards the same cause have questioned the methods and capabilities of the other. Frustrations build up and it can get personal. It's only human.
Suggesting that this rumoured falling out flatly didn't happen, without actually knowing if it did, is naive. It wouldn't be a horrendous thing to have happened either, for one thing it proves both care enough to get aggitated with each other during training.
It also doesn't mean that either will pack up and sulk off to Warrington either. A bit of physical expression between men never hurt anyone and I can't see this being the reason for our shocking form, especially given how consistent Jammer has been.