This articulates quite nicely what I ,personally, see as a deviation from the original intent of the Digital Monsters franchise. With the addition of newer Digimon and their respective roles in the Digital World, there comes a point where either they come to be limited to a particular incarnation of the franchise within the Digital Multiverse, or a soft reboot of sorts ala Pokemon Journeys where they manage to situate each Digimon group within a broader corpus.
Is this how it's supposed to work?:
I think it's not working but I think that the assumption that
there should be something that works is inherently flawed. It could simply be the reality of that world that it doesn't work... and that would seem perfectly reasonable to me.
If the actual religious beliefs can't be fully reconciled, why would the fictional creatures based on them be any more compatible? Why can't they all just roam the world independently, all believing they are the highest authority and occasionally butt heads?
It would make for a chaotic setting for sure, but chaos is not automatically inconsistent and I would argue it's often inherently more believable than order.
Now the graphic just seems to create more questionable implications than it solves...
The inclusion of the crests seems strange because Yggdrasil has never been associated with them, nor have the crests been associated with how the digital world is actually ruled except for being used as a means to unseal the holy beasts in Adventure, who seemed to have done fine before the crests were even around.
The Royal Knights seem to be suspiciously missing even though they'd probably outclass most of the other groups listed there (they'd certainly be more relevant to the world than the Devas at the very least).
If the vertical placement is meant to define some sort of hierarchy, I don't think it adds up, not with Yggdrasil all the way at the top; Yggdrasil is at this point basically the multiverse punching bag, getting corrupted, deleted or otherwise messed with basically every second Tuesday while the God that the Archangels serve is still portrayed as being basically untouched, with some of the Demon Lord's profiles that they might potentially be a threat to him
eventually (Yggdrasil, on the other hand was shown to be no match to even a single one of them in Next). So that would also make grouping the Angels under the holy beasts questionable, especially if we take into account that each of the angels' duties encompass the whole world while each of the Holy Beasts are responsible for only a quarter.
I'd imagine the angels are either Yggdrasil's military or simply beings obsessed with Yggdrasil's moral order with the great angels being the leaders
The angels have never been connected to Yggdrasil (and I believe Chronicle X established the Kernel and Yggdrasil's layer of the Digital world to be separate locations) and his modus operandi seems generally emotionless and based on pragmatism rather than having anything to do with morality.
For Shakamon, I have no idea as I don't have any information on where it exists in the world or a reference of its relation to others other than "Rumored to be the being closest to Yggdrasill in the Digital World" which could mean in distance, in its practice (like closest follower of its teachings?), or it literally met the server and keeps consistent communication
Shakamon is meant to be a Buddha so the closeness is almost certainly meant in terms of spirituality and enlightenment.
Perhaps a parallel could be also be drawn between the "ordeals" that Shakamon is said to impose on the digtial world and Yggdrasil's various shenanigans, but perhaps in a more benign way. His profile also states that he protects the eastern part of the Digital World, so if he has anything to do with any of the other big shots it would most likely have to be Qinglongmon.