Dynamic que is...
like ranking singles and doubles tennis players on the same ladder. Does that make sense to anyone? If I told you I was the #1 tennis player in the world and the system worked like this, it would just cause confusion and disagreement. Maybe I'm a doubles player and someone thinks the best tennis player should be determined by 1v1 or vice versa. The point is, it would be meaningless if you didn't know how the ranking was determined.
It might be fun, but let's be real here in terms of how meaningful it is... a ranking for it could mean a million different things. One guy might have gotten to his rank purely from solo or duo and another with just ranked 5s. The formats are very different and don't belong in the same ranking system because there is no consistency between players. It's not even about whether I'd be the odd man out in a team que or face a 5 man team when duoing etc. Those are secondary issues. The bigger problem is just that the ranking from dynamic que isn't about anything specific.