One account I can be facing 1900s in B rank (have for random weapon learning, to play ranked modes while avoiding ruining main rank) and on another 1900-2050s in S+. Or another example in the same rank on two accounts, say A+, one account 1600s. Other account 1900s. Same weapons, same rotation, just flick between accounts. Btw recently the higher number was on my lower ranked account, but it flips randomly. Could log in tonight and it be reversed. Or both high, both low.
Talked to a couple people and they see similar.
This could account for a lot of frustration and win/loss streaks, esp when people don't realise the insane swing in the matchmaking between people at even the same rank.