Musings on Monster Design in dndnext

So I finally got some time to look at the Bestiary: I had saved this for last, as monsters are my favorite part of D&D. Also, after Mearls' Legend & Lore articles on the subject. Now, the monsters had plenty of positive notes, there was a lot that I liked. However...

Looking over the monsters in playtest 2 bestiary, I can not make much sense of what they are going with when it comes to hit points and hit dice. Basically, it seems from a non-designer's point of view that the there is no correlation between level and number of hit die for monsters. As to why, I have no idea. I have tried to organize things, so it becomes easier to see just how little structure there is ATM. It starts off decently at level 1 and 3, and then the system, if there is one, just breaks down. Take a look for yourself.

Level 1 monsters:
There are 9 level 1 monsters that all have 1 hit die. Small monsters use d6, medium use d8. So far so good. Then there are two level 1 elite monsters. Both small. They have respectively 4 and 5 hit die.

Level 2 monsters:
There are 3 level 2 monsters which (correctly?) have 2 hit dice. The small monsters still use d6 and medium use d8. Then there is a level 2 solo, which is large. It has 7 hit dice, and uses d10.

Okay, so far, looks like 1 HD per level, d6 if small, d8 if medium, d10 if large. And you add 5? HD if it's a solo. Okay, sounds decent.

Level 3 monsters:
One level 3 monster has 1 HD. Another two level 3 monsters have 2 HD. Yet another has 3 HD. We also have two level 3 elite monsters with 4 HD, two elite level 3 monsters with 6 HD and tthree level 3 elite monster with 5 HD.

Okay, no long sure there is a system. Still follows the 1d6/1d8/1d10 spread depending on size, but otherwise, I am at a loss.

Level 4 monsters:
One level 4 monster has 3 HD. One has 5 HD. One level 4 elite has 5 HD and another level 4 elite has 6 HD.

Level 5 monsters:
One level 5 has 2 HD(!!!), another has 3 HD, and the level 5 elite has 7 HD. Still following the size HD-rule though.

Level 6 monsters:
The level 6 monster has 4 HD and the level 6 elite has 7 HD. Still following the size HD-rule though.

So, what does it all mean? I am not sure. I like the d6/d8/d10/d12(?) HD depending on size, makes sense. However, it would make total sense if a regular monster had 1 HD per level. Apparently that is not the case. Then an elite monster would have twice that, and a solo 4 times that? Or perhaps that is too much. Perhaps the "modifier" should be different, an elite monster having *0,5 HD extra and a solo 2* HD. I do however expect a fixed modifier. Right now things seem arbitrary. Maybe it is the result of the monsters not being the focus of the playtest, or maybe it's because levels and such have been changed so many times they lost track of what needed to be edited. Either way, I hope we soon get some more info about how to build monsters in dndnext.