So since we're talking about PS falco dair, I remember bringing up PS dair --> dsmash like a filthy peach main. Everyone said it's completely situational and I agree, but I got it completely by accident (tried to dair, but PS'd into dsmash).
This happened like a month or so ago and I forgot to tell everyone lawl. Haven't attempted it since, so 100% success rate. But seriously, I think this might work for a high dair. SDI back while you powershield and then dsmash. Comes out about 7 frames slower than grab and with falco's jump squat being so slow and no falco player shining for ONLY one frame, I'm pretty sure this would work if done perfectly given the falco shines for 2 frames. Might even work if perfect because of it being able to drag falco out of the air before he performs an aerial.
I know it sounds silly, but can someone better than me test this out? Could be more jank ganon ****