You misunderstood my post, sorry that I wasn't apparently clear enough

. Fox doesn't really stuff moves much, except for sometimes with bair and utilt, and usmash. I wrote the definition of what I understand stuffing to be: Marth fairing a fox out of his nair is stuffing, using better hitboxes to directly hit opponent out of his move is stuffing. Fox doesn't work like that, he wants to mainly evade attacks and punish or get close during endlag.
Zard fox matchup is pretty interesting actually, I don't know at all which is better in it. Zard wants to keep distance from fox while fox wants to get close to charizard. The neutral game is very different from the typical fox vs fattie since fox doesn't have overwhelming mobility advantage in the grounded game, zard is almost as fast as fox, and is faster than marth. I don't think lasers are really relevant to the matchup since zard is so fast and stage is very valuable for fox. Retreating lasers in the neutral are actually very big risk, since zard can get a dtilt or nair out to hit fox from so far away, and fox doesn't want to get himself cornered either. In some situations they are free damage of course, but usually not much until zard comes to threatening range. Regarding fox baiting out aerials, I think zard shouldn't jump in the neutral game vs fox at all except maybe very sparingly nair out of dash back. Zard basically doesn't want to do a move first, since whiffing one usually means fox can either punish you or get close to you. Fox on the other hand has hard time approaching zard since he has much better range and can get big hitboxes out fast. I have been working with pivot jabs and ftilts, and they make approaching with shorthop aerial against zard pretty risky since if I'm dashing back I can pivot jab or ftilt through his moves on reaction. Zards problem in the neutral game is that he really doesn't seem to have any safe threats that don't yield stage, and thus it can be hard to keep fox out.