Could be true. The version where he observes them leave with sick MH then come back without sets up her inadvertently walking out to throw up again (lines to bathrooms too long) then being denied re-entry. Why not reported if plausible? LE may have their reasons and have declined to talk about MH's state.
The version where he actually escorts her out seems more far-fetched to me, but if this good Samaritan did physically lead her out of the arena, then that would also explain her being stuck outside (though one thinks he would help there as well if his helping was genuine, imho).
Here is something I've been thinking on MH's reported "mental states" and other details, with my notes. This includes verified sightings reported by LE and other unofficial things that are out there.
Arrival at Arena - psyched about Metallica, not opening acts, not visibly impaired
In seats - acting wild, eyewitness concerned about her falling over railing
In seats (later) - sick, as per principal's friend's report
Outside arena - pissed about re-entry policy and joke about Pantera shirt; little forthcoming from security guard; seemingly composed (or angry or confused, but no reports of that, only speculation) on 8:48 phone call
In main JPJ parking - stumbling and dropping purse
Walking in UHall parking lot - I'm thinking that was lots of time to cover not much ground, meaning she was hitting up scalpers or maybe walking and texting? She was not clearly with anyone, not in obvious distress, still carrying her purse.
Brief interaction in R.V. lot - little known about this, but no reports of distress, sickness, or topics of conversation (or with whom, except that they left, apparently confirmed, shortly thereafter). No mention of purse.
On Copeley Bridge - seen on both sides (closer to Lannigan/UHall/Arena then closer to Ivy Road and strip shopping centers), with no mentions of being with anyone, being impaired, being in obvious distress, or texting while walking. No mention of purse.
Later in main JPJ lot (iirc), Grandmother there to pick up grand kids after concert reports seeing an altercation with one man, though I don't think she said whether they then left together or apart or in which direction.
Later on Emmet Street heading toward UVA - report of seeing her with 3 men. Don't recall that she (if it was even MH) was thought to be in distress.
Later still (3:00 or 3:30 a.m.) in Academical Village - report by newspaper delivery woman of seeing her with 3 men, but no mention of distress or impairment.
Not sure when - people who stood up in search organizing meeting to say they saw MH with 3 men, but I didn't hear what time they were claiming this happened or where (was it also Academical Village and they were coming from a wedding reception?).
I'm not sure what this all suggests, but I keep thinking if we knew what she was seeking in leaving the arena and in walking wherever she was going that that might unlock something. And, again, LE might know and not be revealing.