Chins are an assistance exercise, not a primary exercise. The fact that no specifics are given is indicative of this. If you're not weighing your clothed body prior to every single set, and adjusting the load on your body accordingly for a total weight, you are inherently not doing an exercise that's progressed the same as a barbell lift. The ROM for chins is also subject to a higher degree of variability than the primary barbell lifts. All of these together mean that you're stressing too much about this.
Don't let an idol of perfection lead you astray. You need to play around with this exercise to figure out what works for you. Are you worried that Rip will call you out with the dreaded "YNDTP"? If so, he's already essentially said that this (and your dips questions, which are not at all a part of the NLP anyway) is not a matter of specific compliance. You are free to experiment, and to learn. Consider it a foretaste of growth into your post-novice programming, lean into the uncertainty, and enjoy learning how to learn.
I just don't like to play around with things since Rip already knows what the best protocol is. So I would rather follow what he recommends. Even just general guidelines would be nice. Like "do a regular 3x5 day then another higher rep 3x10-15 day" would be very helpful.
The point is, there is no best protocol here. The farther you go from the NLP and the farther you go from the main lifts, the more variables come into play. The more variables that come into play, the more diffuse the solution sets become.
This is part of what makes some exercises assistance ones, not primary ones.
You may not like to play around with things, but if you want to stick with training, it's your destiny. Embracing that will be more productive, not to mention more satisfying.
Would you call benching 260 for 5 (and going up weekly) a problem in isolation or only because of the amount of weight I chin? If the former, fair enough, although that's a high standard you're setting. If the latter, I could just stop training the weighted chin up, allow it to regress, and be totally fine without improving my bench by one pound, which is ridiculous