Hmmm.
Lack of personal creativity and invention has been brought up multiple times..... by you!!!
My conclusion is that the guys involved in these tribute acts are not creative or talented enough to come up with their own material (or at the very least material that can pay their bills) so they resort to playing someone else's stuff to make a living.
But that does not relate at all to what you said. You said there was a point made, in this thread, that "people should only play their own material". That is just not true, I didn't read a single comment saying this.
I don't really have a problem with amateur musicians or cover bands doing the odd performance (which is what you're trying to implicate in your statement) or teaching or even coming up with their own interpretations of the songs, I like that a lot.
It's just the fact that a bunch of guys are using someone else's work to sell themselves and catapult themselves to a status-quo that, if they weren't using that material in the first place, would be unreachable. Or maybe wouldn't be unreachable if they were talented or creative enough to come up with new songs/material/work that could engage the public or pay their bills, etc. With this in mind, myself, and probably quite a few others on this forum, find the modus operandi of bands like DSL very dubious and/or reprehensible.
"Marco Caviglia who is widely regarded as the world’s leading authority on Mark Knopfler’s unique guitar-playing style." DSL has this statement on their website. I mean, do these guys not feel self-conscious when selling themselves this way? Who even thinks this/says this? Regarded by who? Himself?
I hope what I'm saying is understandable this time and doesn't get diluted away.