Agree!
Also agree here!
In this very floaty sound in contemporary worship music, you can go into any sus or add4 or 4 chord with both of these ideas in mind.
If you’re thinking of playing bass ideas outside of root and 5th, just try different combinations. If the 3rd of the D still sounds good - great.
If the 4, great.
Most of the time the 4 or add4 is something that is a function of a keyboard drone or a guitar high string that keeps ringing out, and actually doesn’t have much to do with the chord movement.
I’d probably - because I went and listened to the song and tried it out - would go with the option of 1-3-4-5 if I were to play anything other than root and fifth. A leading tone in the bass there would sound good, if it were placed nicely.