I'm not disregarding the fact that he's growing, but he can't have grown to the point where he's stronger than Yang Gan in such a short space of time. Look, it took him more than two and a half years to reach the power he had during the Rogue Hunt, and there he was still much weaker than Prince Song, no matter how much his growth is said to be "irrational", if we use him as a basis, the "unpredictable" becomes "predictable", so according to reasonable estimates, it is impossible for him in his base form to have already reached or surpassed Yang Gan or Prince Song.You are under the assumption that Ruo power is static so he didn't grew beyond the timeframe and
"As you ready to depart, a few people also give you their parting words. First, comes Tang Ruo. "End it fast." — he says — "We can then have a proper fight." No need to waste time on this trash." Wouldn't make sense according to your Ruo power levels and plans as it would be a massive massive time waste
If I as a reader am able to see it that way, the Elders as skeptical as ever must see it that way even more.
As for his speeches, I can only think of five characters he doesn't consider to be "trash", so his speeches don't mean much.
Again, I'm not diminishing him, he's invincible at his level and stronger than most of the elites at the next level, but there are simply people who are much stronger than the so-called elites, such as Yang Gan and Prince Song, Ruo at the lower stage is simply not strong enough.