Those vids dont do his performance justice imo.
It doesnt show how terrible Barca was playing before he came on, Paris getting chance after chance.
Camera switching to Messi constantly to capture his nervous reaction. Pastore scores and Messi gets up immediately.
Crowd goes insane when he comes on, players seem to get an instant confidence boost and for the first time in over an hour the flow of the game switches and Barca get the upperhand. Messi (even still injured) psychologically caused fear into the psg players and made them stop what they were doing for more than an hour, Barca got back right back on track and went to the semi's.
Those vids only show his contribution to the goal and him being mostly limping injured struggling to be his usual self but it was so much more than that.
That was extreme messidependencia. Game vs Bilbao a while later as wel for example, we shoud have became champions at that point, it would have been perfectly fitting for the entire season.
In hindsight though it would propably have been better if he stayed on the bench against psg and we got eliminated. It would save us the 7-up vs Bayern and having an injured Messi all the way into 2014.
But thats life, eventually all these things led to our treble winning epic season, so its all good.