If possible OT content is splitted before it overtake an entire topic.
Since there are no specific moderation tools for these instances all extra operations require a variable effort from the active moderator.
For example in some case it would be possible to use a poll and reference the splitted topic from the originary one.
Since moderators are volunteer I guess it would be too much to demand them to overcome every SMF engine glitch manually.
Besides the reason some posts were splitted was because the policy encourages members to address some specific comments by PM In order to preserve on topic content.
And the splitted topic contained a discussion questioning the timing of another member post. That was the only element that could be considered relevant to the originator topic.