Scriptural guidance is not Scriptural authority and adherence. It's the governing bodies' authority, with a li'l guide from Scripture.
I think you're using a hostile reading. Scripture doesn't tell us that X can or cannot be ordained. It does set standards which we have to apply to the candidates. Those standards aren't black and white, because we get no candidates who aren't sinners. So we are guided by the standards, but they don't dictate a specific decision. I believe it's reasonable to call this assessing candidates with the guidance of Scripture. If I had been wording it I probably would have used the language from the ordination vows and said under the authority of Scriptured and guided by the confessions. We're already committed to doing that anyway. But I honestly don't think there was any intend to minimize the authority of Scripture.
G-6.0106b tried to go beyond guidance by saying that Scripture made certain sins completely disqualifying. That could work if you were careful enough in the wording. But they failed to think carefully about how to do that in such a way that it would work. Since the only point of the paragraph was to force hostile bodies to do what they wanted, they had to assume that G-6.0106b would be applied in a hostile manner. They left too many loopholes. They would have had to say "G-6.0108 not withstanding, no person who is currently engaged in homosexual sex may be ordained." And even that might not have been good enough.
But if we back off of making lists of specific sins, and want wording that simply says to follow Scripture, I think what we just did is as good as any. Is there really a difference between saying that we have to assess candidates guided by Scripture and saying that we have to adhere to Scripture in assessing candidates. Both allow for, and indeed require, use of judgement in interpreting and applying Scripture to the candidates.
I understand that you don't think the current PCUSA approach to Scripture is right. I'm at least as concerned that the OPC has abandoned the Gospel as you are concerned about the PCUSA. But tweaking wording in the Book of Order just isn't the issue, and saying that the change in G-6.0106b represents abandonment of Scripture is irresponsible rhetoric.
It's irresponsible because we've got a few individuals and sessions who are panicked. Rabble-rousing does not help them make an honest assessment of the situation, to see what they really should do. I have the suspicion that some people *want* to create panic in the streets, but I trust you aren't one of them. If people honestly can't deal with the PCUSA the way it is, I want them to go someplace where they can live as Christians with a good conscience. I just don't want them to take action because they think the PCUSA has suddenly changed our attitude towards Scripture, or has removed the only thing that stands between us and adultery. If you want to criticize the PCUSA, do it for the right reasons. If we depart from the Gospel, it isn't because we changed the wording of G-6.0106b, and keeping the old wording wouldn't have turned us into the OPC.
Frankly, I would think the OPC would have a vested interest in this. If you get a substantial number of congregations that are actually mostly in agreement with the PCUSA but got panicked into overreacting, in 20 years the OPC will find itself in a position you don't want to be in.