Highly debatable. Without us, Kona likely won't success in bailing her out when she was kidnapped. They're likely won't be able to deal with Valigarmanda. And it's doubtful they'll be able to resolve the Mamook Ja issue as smoothly without the Scion's connection. By the end, the Scion pretty much throw the entire weight behind Wuk Lamak to make her success.
Even if you want to argue that it wasn't entirely necessary and Wuk would still make it to the finishing line through a bunch of convenience coincident, the spirit of the narrative is still troublesome. Remember that in the beginning we were shown in no uncertain term that Wuk had almost zero popular support while her brothers were extremely popular. Yet by the half-way mark after just a few limited interactions, we already decided Wuk is the best person to rule simply because she align with our view of the world order, while also declared (by Thranced) that Zoraal Ja can not be allowed to win no matter what despite him being overwhelmingly more popular among his people ... that's just incredibly hubris and out of character for the Scion to say the very least.
Whether it's right or wrong decision is not the point either. Say if there is an election coming up in another country and we (correctly) identify one of the candidate is a neo fascist, even if it's not gonna be something like "bay of pigs", would be ok for us to funnel resources behind the scene to bankroll and make sure the opposition win? Doesn't matter if it's the right thing to do, or that most people ok with it, it's still meddling.
And like I said, the most jarring part of this is the fact it happens right after the 7.0 declaration when the Scion wanted to limited their influence, yet DT immediately threw us into the other extreme of the spectrum, that's why it's a consistency problem.
Gulool Ja Ja even said that this rite of succession was really more of a test to see who was fit to lead, and that he would not step down if he felt no one was ready.
And that would be a much more interesting scenario: all of them fail (in fact without our help Wuk Lamak probably would be the very first to fail). Gulool Ja Ja then lead the defense against the Alexandria and get killed, forcing the failed candidates to come together to protect their nation. The Scion then offer help as it is our role and also as the experts in term of interdimension invasion.
Or, let Zoraal Ja win because face it, if there is one candidate who can win on his own merit, it's him. Yes he's not ideal, yes his vision is troublesome but that's exactly the kind of things that's inline with the Scion mission. To keep an eyes out for trouble, to brace and prepare for the fallout, and to put out the fire when the issue flare up. Remember originally all 3 of the original Eorzia nations had bad governance issue, and we painfully help them resolves those issues one at a time (some time fumble and fail ourselves).