Regarding Spios and Pgrens, neither of those are mainlines. Particularly not Spios.
I realise someone else has already mentioned this, but I think it's worth reiterating.
Just because you don't have half a dozen of X unit on field, does not mean it should be ignored, its a stock unit, its a meta unit, its in every, single competitive game AND it arrives before PPSH as well.
You can close your eyes all you want, it won't make it disappear.
It might be a shocker to some of theorycrafters here, but game is not a set of 1v1s non microed units on a flat map with stripes painted on it.