This sounds like it will be a good thing for all three forums. OBOB will probably be a more peaceful place (I assume. To be honest, I haven't really monitored or posted to OBOB regularly in a long time, so I don't really know the current state of play,), and both TLT and SOTE will be allowed to more fully develop in a way consistent with their purposes and membership and incorporate more of the posters who might find either one of them a good safe haven and affinity group.
If I might offer a very small tweak to this, as a suggestion:
Since OBOB is now linked to in both TLT's and SOTE's State of Purposes, could we have OBOB include a link to both of these forums in it's Statement of Purpose, and include a link to TLT and SOTE in the statement of purposes of each other's forums as well?
Basically, it'd mean that every Statement of Purpose in any of the three forums would include links to the other two Catholic forums. This would be helpful to people who may have followed a link to one forum, and would like to explore one or both of the other forums to see which one is right for them, or to see if multiple forums fit them, but have no idea that the other two forums exist (I have seen posters who aren't aware of where they are posting and that other Catholic forums exist in different places from time to time).
Basically, it's cross-promotion that work to the benefit of all three groups, I think, and would be a service to the membership of the site. It would both promote more cross-traffic, and also cut down on inappropriate posts from folks, as they could sort themselves more easily on their own initiative.
It also seems more fair, because if we view these as three equal forums, having two link to the one, without reciprocal links, gives the impression that they are now (i.e. If we imagined that three separate people ran each of the forums and negotiated things, they would all almost certainly ask for reciprocal links in exchange for posting links to one or both of the other forums).