This whole post has a poorly-veilled nasty tone to it, imo.
As for avuncular - perhaps it is down to the sort of uncles one has had, but my perception of avuncular is a reasonably kind and generous nature but with more than an element of grumpiness and perhaps even short-temperedeness about them. There is no evidence of Markus being grumpy or short-tempered.
Just looked up "avuncular" in a dictionary and the definition does not refer to grumpiness or short-temper, so forget my question.