Ok, fair enough, I will defer to your greater knowledge of Scottish football, and treat them as a different club.
Bearing that in mind, then there is certainly one thing we have to be in agreement with when we look at things objectively, and that is the magnitude of their achievement.
A newly formed club starting in the lowest division getting promoted each year and then within a few years winning the EPL, it is hard to argue against that being the greatest domestic achievement by any Scottish club. It is some fairytale all the same.
I've no doubt as a fair minded individual you have a similar view.
CS, it might be helpful if you actually learnt something about Scottish Football as you're clearly out of your depth here.
You might want to check out Motherwell v The Rangers in the playoffs. 6-1 aggregate trouncing.
And as for it being the greatest domestic achievement by any Scottish club, even if they had achieved what you claimed (they didn't), again you're showing your ignorance. Celtic won the Treble 4 seasons in a row quite recently, something that is unlikely to ever be achieved again, given that in the previous nearly 150 years of Scottish football no club had even managed to do it even 2 seasons in a row.
And while you may marvel at the achievements of TRFC since 2012 you need to bear in mind the fact that they've been living beyond their means again in doing it. Something that saw the original RFC go the way of Renton, and Third Lanark before them. "You've got to cut your cloth according to your means" is a credo that is anathema to those at Ibrox