In regards to it being better or worse than a cooldown, it's better than a cooldown because your rc starts to regenerate immediately

I have one more question. There is a need for "undelegation" at all?
I mean ..the delegator will start regenerating RC right away, so why "undelegation" is required?
Why cannot we consider the RC as "sent" instead of delegated? At least this will make the whole thing easier to think about.