So I have resisted chiming in on this thread as a small bike and middleweight bike rider, however, this video is good to show many things about A group and smaller bikes. However Kalen, since you posted this video, I will just use this as I believe there are some good visual learning points for all in A group and is relevant to this thread.
Some of the difficulties are represented well at around 6:30 in the video. You have a small bike riding well but for half the track, bikes begin backing up on each other. Not the small bikes fault, but a reality that occurs with every session. The problem then becomes prevalent within the trailing bikes as to who will take the first shot and where. Then it becomes how will the small bike react and where will the trailing riders go, or be forced to go. Good decisions are needed by all until the traffic jam is cleared up.
The next scenario is presented at around 11:55 when 2 smaller bikes or friends are riding around together, worse when it's the latter scenario as the 2 typically forget there are others track.
If we all agree that about 2/3's of the track width is usable for most of the track, when 2 people are riding around together and are just pulling up next to each other for fun or to look at each other, the 2 riders need to keep in mind that on corner entry and exit, they have now just taken up the 2/3's of available track.
The pass on the straight shows rider(s?) looking at each other while a bike now passes on the blind side against the wall with a substantially high delta, and one could assume this was their only option as the other bikes were side by side with a seemingly large gap in between the two but not enough to allow a pass in between which would probably be considered an asshole pass.
This is compounded when there is no intent to pass but to merely just ride side by side. The problem in A group is someone who could have as high as say a 50mph delta, has just had their options cut down drastically. So in my opinion and something I try to do every time I decide to ride my R3 in A group, it is critical that when small bikes are out and especially riding in groups, the intent to pass should be the strategy any time you swing out, or just stay in line until you have a better opportunity. Side by sides just because are a potential for bad things to happen behind.
I believe it's very difficult for all the providers to accommodate this issue as you typically, but not always, have pretty high caliber riders on small bikes who understand lines and typically stay on them as that's the only way to carry speed. Versus the large displacement riders who may have good pace because of the ability to throttle down the straights, but may be lacking in carrying corner speed. And the difficulty for the track day provider is to accommodate both ends of the spectrum to ensure both are having a good time.
In the end, we all should understand our strengths and weaknesses, as well as be honest with our lap times, capabilities, and egos. As cg-ops stated earlier, "can't we all get along?"
Again a reminder, this is no knock on Kalen, only that she provided a good video for this thread. Having done a couple of track days myself, I can tell you I have seen far more worse examples up to and including 2 riders slowing to around 30mph between 2 and 3 at Thill so they could talk to each other. But we should all be diligent in considering each others safety while enjoying a hobby we all love!
Humbly submitted by an old guy who rides an R3 and R6 and just try's to keep out of the way and successfully make it back to the pits each and every time out.
Aside from the conversation veering off from the topic of the post, in order for any debate/dialogue to be had, assumptions are required. Expectation and assumptions are not the same thing. 
