I've come into contact with supposed Saxons myself even though not in the cases highlighted here. In Thalmarkin, at one point we had 8 out of 40 nobles who supported eachother blindly from the get-go. I think originally 6 were "Saxons" and maybe 2 were driven into their arms by mutual hatred of my character.
Either way, we tried to make it work, their leader was an old general of ours (who really helped us survive during the 4th invasion) and lord of our 2nd richest region. They took some independence, created their own army without much communication which then caused quite some conflict. Anyway it didn't work out. We had some huge discussions, quite some protests but in the end we banned them.
Now you can say what you want about how they operate, and if it is acceptable that such new characters immediately support eachother without question, but it was great fun from where I was sitting. We've always had our portion of slumbering internal strife in Thalmarkin but this was right in the open, very vocal and really, a great pass-time until we were ready for war.
Had they managed to take over the realm - which I doubt was their intention - I would probably have been thrown out along with a couple others and that would've sucked because I love that realm, everything about it and everyone in it. But I would've just gone to another realm and vowed to destroy them... which would have been great fun as well, win or lose.
My point is, there is nothing wrong with clanning, not even with a clan TO in my opinion, as long as it happens IC and you don't exclude people. If there is a case opened against you in the magistrates you should look at these two criteria and see if you're really doing everything by the books because if you aren't, you may be having lots of fun, but you are keeping others in your own realm, or outside of it from sharing in that fun.
The more the merrier goes the saying after all.