I know that's the smart thing to do, should have skated his setup for more than just 2 ollies to see if the novelty wore off. Doesn't help that I have some 8.5s on hand which got me thinking of sizing up but I don't want to get into a brand new ecosystem of 8.5" trucks.
Doesn't help that I can't pinpoint what caused me to like his setup. The height + weight of Indys? The steep FA kicks? 54mm Bones Wheels?
Yeah, too many variables right there.
For me sizing up was worse than pulling teeth, as I had my usual 8.12 black eagle on 139s as a normal board, then had one blue eagle 8.5 on 149s with all those proportionate parts, as well as a white eagle 8.75 on 159s too, but the bigger boards were always more just a fun roll around rather than trying the same things on them.
I still skate my old smaller boards sometimes (trying some flip tricks occasionally) but more so now I have let that go and just been more so rolling around and doing everything else (no flips really, but I did a month or so ago just for a laugh) on the bigger 8.38 or 8.5 sized boards as my usual go to.
Sure others can flip and throw around bigger boards when they get used to them (and even I could too if I really tried) but to say it changes everything to go up is an understatement.
If you had the space and resources, I found it is good to have one or more of the different / bigger boards set up and there if you needed to try it again, or other sizes than you usually skate, just so if or when the madness takes hold, you can jump on it and have it, or even for others to try, but with constraints on space or other things, it might be better to just stick to the good sizes and things you know and focus on that.