What sources do you think we can find that experts haven't already found?
One of the things that dismays me about this discussion is that most of participants have never read about other families in this same area so they have no idea of the complexities and uncertainties.
It's very common for families in Orkney and the Hebrides to have ties to Norway, to engage in political games of playing the Norwegian kings against the Scottish kings, to retreat to Norway when defeated, etc. And, the uncertainty of the sources is massive. There is uncertainty whether "this man" in "this source" might be the same as "that man" in "that source" There are traditional lines that can't be right, and that contradict each other, and there are speculative lines that could be right but no one can be sure because there are other ways to re-arrange the relationships that also could be right.
Look at this article on Somerled, and notice the three different charts that show the main theories for this connection to the Scottish royal family:
https://en.wikipedia.org/wiki/Somerled
Or look at the literature on Snaekollr, supposed ancestor of Clan Gunn:Snaekollr Eiríksson
http://clangunn.weebly.com/why-gunns-are-not-of-norse--orkney-desce...
Then there is the problem of the MacLeod ancestry:
http://www.clanmacleod.org/genealogy/macleod-genealogy-research/the...
If you read enough of these articles, you begin to see how complicated the questions are, and how little help there is in contemporary sources.
One of the most noticeable things about the Skanke claim is that the discussion seems to take place in a vacuum, with no real understanding of what else was going on what other families claim, and what sources exist or don't exist.