So what do you want first Dave, the evidence or the theory?
Evidence. Craft a theory to fit the evidence, rather than attempting to force the evidence to fit a theory.
There is considerable evidence coming out of the East Coast of Northern Canada at the moment that clearly showing a Norse presence here and an extended one at that. The connection between the Orkneys and Norway is deep and beyond doubt. If we are to throw out works due to errors, we wouldn't have a map left of the so-called New World before the 20th century.
No argument here. In fact, it's something that I've pointed out repeatedly in a number of these threads.
So the evidence for a Norse presence is there and it is growing in its geographic scope. The connection between the Orkneys and Sinclair is there. Henry Sinclair pledged his fealty to the Norwegian king. Norway - Norse - Sinclair - narratives - archaeological evidence of a Norse presence in Labrador, in Newfoundland, with a renewed focus upon Nova Scotia - this stuff is not made up.
Agreed - the norsemen made it to both Greenland and Newfoundland. There can be no doubt, as we have conclusive evidence of this, and I don't think that anyone is disputing that. Further, there is (to me) strong evidence that they went quite a bit further south than that. I have no indisputable proof of this, but I disagree with the interpretation of Vinland being at L'anse Meadows. Furthermore, even if it was there, it wasn't as if these explorers simply would have sat down and said, "All right men, this is far enough." That's not how they operated. Again, not indisputable, but it's strongly hinted at and just as importantly, it's a logical theory.
We also know why they went to the New World in the first place. They wrote it down, after all. It wasn't a secret.
That having been said, what does all of this have to do with Sinclair? Or treasure?
It becomes easy to see how the suggestion of Sinclair being here in NS starts to gain merit Dave. In the end, it may not have been Sinclair, but it was someone.
For the former, no it does not. For the latter, it was many someones; some of them are named in the sagas. Bringing Sinclair, Templars, and even treasure into it is an attempt to force very questionable evidence to fit an illogical theory.
So, to recap:
Norsemen exploring the New World for fun and profit? Indisputable and logical.
Norsemen hauling former Templars, their treasure, and the jarl of the Orkneys under an assumed name to the New World to bury said loot and build a castle? Highly disputable and not logical.