Is grand arena opponent selection totally random?

It seems so. I’m roughly 4.5m GP. Last round I had a ~2m GP opponent. The current round I had a  ~10m GP opponent. The result was totally predictable in both cases.
I’d suggest improving the opponent selection algorithm, so that the parties differ by, let’s say not more than 1m GP (using it as the easiest match criteria) to make it really challenging and about strategy/tactics, and not who’s got “the bigger gun” with your relic 5 against their relic 1 or their relic 10 against your relic 5. Thanks!