Big 3 ?
I wonder what reason niki will come with so ruo don't get killed after Yichen dies
Since she will be target of power hungry wolves to fill power vaccum
She may not die but she is definitely not becoming empress that's for sure (unless mc helps her and that to later)
Big 3
Mg, dq and yang patriarch
Now apart from this should Yichen die @ book 1 where ruo bcomes ex alongside mc he/she would be nearly unstoppable, because with the xiantian body his skills will obv skyrock too

MX ruo should be capable of handling his aunt or Atleast going toe to toe
Now imagine him, his aunt and mc( if you decide to side with him) in one faction

You think they'll be anyone who can stop them?(again aside the big 3)
Now the reason I said MX ruo and mc and not EX is because obviously if Yichen dies they would be fools to announce it and being smart they'll that time and effort to make ruo mx
And as we've seen base ruo can fight 2 stages above ( above average ma)
So adding his other hax and abilities should make him win( even if barely) against an average or weak 3 stage MA

Now when you add mc to this logic, who is said to be stronger than ruo in base at book 2( rumoured) you virtually have one of the most overpowered duo to ever walk planet poma
Please note that this is just my opinion and thought, cause I mean cmon, tri-dao, qi condensation, asura,great circle, god reincarnated MC & Dragon transfo, sharingan eyed, pill prodigy( had to insult him cause I hate his a**) celestial Prince doesn't sound badass