The fact that the Elders summoning circles have numbers but the God's Knights don't, does at least confirm that those numbers do mean something.
The question is, if the number ranking is based on power level or something else.
Those into agendas and power level discussions will say that the ranking is based on power level, and that could still be the case.
But I also do think that the ranking could be more based on the order that they became Elders, and not power ranking like some may believe.
If it is the latter and it's based on who joined first, then the ranking might go from oldest to youngest.
If that's the case, then that would mean that Ju Peter is the oldest member and not the youngest.
Which is something I could maybe see Oda do, the youngest looking Elder is actually the oldest, while Saturn who is the oldest looking member is actually the youngest.