Dunno why people need to throw this "worst ever" doublet in at every second opportunity.
https://www.etymonline.com/word/worst#etymonline_v_10854
The online etymology dictionary (etymonline) is the internet's go-to source for quick and reliable accounts of the origin and history of English words, phrases, and idioms. It is professional enough to satisfy academic standards, but accessible enough to be used by anyone.
www.etymonline.com
Maybe you actually mean it, but I guess neither you nor anyone else throwing the words about have seen all Rangers players since 1872 ... or can even remember all of those last 2 decades for that matter.
IMHO, most of the guys we got came here and gave their all, even though "their all" was not what we (living in a somewhat peculiar and lofty world of the Rangers FC support) expect from a "Rangers player", no matter where we were back then. I reckon some sure came for the fame of having played for Rangers FC and/or the money, but they came when scores of others turned us down, not least dozens of (so-called) Rangers supporters amongst the Scottish players.
When you check Willie Vass'
Glasgow Rangers - The Journey you will find plenty of names now long (and possibly best) forgotten, yet unless these chaps turned crackbrained like Kyle Hutton, I'll thank them for helping us in times no-one else would and got us back where we belong.