Gullibell - I still don't see it...
gear fail = the shaft between the input and output end of that gear breaks, however so. The input part of that gear still turns freely thus continues to transmit power from #1 engine output to the TR drive gear.
yes, of course there will be a TQ split between the engines if one engine is driving the main rotor and the other is driving the TR. There will be a point in the collective range of travel where the TQ on each engine will be matched.