I said it too. Trippier is not Walker. We would be weaker for his sale, and so it is proving. But Aurier is better than Trippier - and much more suited to days like today, when our wing-backs are required to defend huge stretches of space by themselves. Trippier is *useless* in that situation - not quick enough to get forward or get back, not physical enough to even face Sane, never mind the rest of their team, and not technical enough to evade their press, *despite* his skill on the ball. He is useless. That was clear at half time. Poch knew this. He changed nothing.
Aurier *would have* done much, much better. If your hypothetical is that he would have given away a pen, I still would take that over giving away three goals in *total* down the right-hand side.
Another brilliant comment. "Aurier would have done better" - presented as guaranteed, nailed on, factual...there's no way of proving whether he would or would not have played better. Personally I don't rate Trippier but Aurier is a liability and I'm not sure his brain-dead, headless chicken charging around at 100 mph would have been of much benefit today.
Between the two of them, I'd play Trippier in harder games given he's better defensively (or, more accurately, Aurier is a liability defensively) and then play Aurier in easier games given Trippier never takes his opposing full-back on