Probably should also have a point @ 'CR32' in it, due to not being able to go NB onto US-85 @ the northern end too.
Makes sense to me.
It doesn't look like the southern end of co.us085buspla ever reaches US 85. Google Maps, Wikipedia, and CDOT all have it ending at the intersection with CR 28, just west of the purported southern terminus. The loop isn't even signed heading NB on US 85.
I mean that's about three steps worth of pavement between the two points, and from the looks of it CDOT paved that 30-foot stretch the last time they resurfaced mainline US 85 (would also likely plow it when it snows too but that's just a guess). There's all sorts of forced connections in CO that don't exactly follow OTIS (as otherwise US routes would have gaps at interstate bridges, state lines, and other things).
TL;DR I'm leaning towards keeping that short segment between CR 25.5/28 and US 85 unless there is a strong community consensus against keeping it.