I often time see people say things like
"I can't tell if I like it until I hear it in a mix", and that seems very reasonable.
But, consider another perspective. Let's say I have a bass in my hands and you are playing drums and we have a rough mix in the head phones.
Something about that drum playing has to appeal to me to get my bass juices flowing.
So, right here at the moment of inception, I have to either hear "it" and play along so as to make a "mix", or I can stall out and wait for nothing to happen.
My point is, drums are usually the back bone of a song... you can't "wait to hear it in the mix" before you decide it sounds groovy. You are well served to listen to the drums and play something that sounds real good with them.
That is one of the mysteries of drum tuning. Many people deny there is any chromatic information in a trap kit... but we have all experienced hearing a bass player lock onto a drum groove and instinctively hit the notes and song key that really gels with the drum kit's tonality. That happens in jam bands all the time.
The sound of the drums inspire certain chromatic ideas and discourages others.
You can't just wait to hear it in the final mix.
Well, you can.
The quotes used above are universal... I'm not calling anyone out.
These are just some random thoughts of mine.
What this means is that Paul's drumming might be ready for a mix... but we just don't know what the song is yet.
If you start with some other instrument then you might have to fit the drums onto it. That can be difficult.
There's no better or worse way I suppose, but I do find that I like songs that evolved from a strong relationship between the bass and drums so that work flow is probably a good one.
best regards,
mike