Touchdown Signals

[Admiral]

I suppose I should have been more descriptive with my question. It isn't about mirroring, although it is a good discussion. Last season, I had a goal line play. Team A runs up the gut into a pile. U had the ball in, I thought it was in, but was looking at the blocking - not the ball position. BJ was on end line, and couldn't see the action. I checked both wings - HL was crashing in with a spot, LJ straddling the goal line. HL did not have a clear view of the ball once the runner hit the line, but saw his knee touch. LJ had his view completely obstructed. U relayed he had the ball in before the knee touched, but neither wing would signal. In a situation like this, is it acceptable for U to signal? It turns out that A fumbled into the end zone on the next play and B recovered.