@tighten_returns: I might be remembering wrong on Elsa beating Conner, but she did hold her own against him on multiple occasions. Zeltrax however has consistently beaten her whenever they've fought each other as he's the stronger fighter of the two. If anything, Zeltrax scales higher than Conner as he holds his own and has beaten Tommy Oliver who is a much more experienced and powerful Ranger.
The Power Rangers Wikia states that he's not as fast as Conner, but still super-fast. When Conner uses his super speed time freezes or slows down for him. IF anything, it shows that Conner's reaction time is horrific as he's hit by a non-super speed hit at 43 seconds into the same video.
@tighten_returns: Not necessarily stronger, they tend to fight a lot of enemies multiple time and come to a stalemate when they're technically weaker than them. Conner fought Elsa (who is weaker than Zeltrax) on multiple occasions who came to either a standstill or won.
Conner doesn't even react to the White Ranger's super-speed which is technically slower than his as it's not his main power. About 20 seconds into the video.