IMO when a person is not respected as he should have the right and duty not to lend his side by paying with the same behavior that he received.
Mark responded in this sense when he said that the thing as it had been studied at the beginning was not convincing neither him nor his manager and Mark decided not to participate at ceremony.
I don't believe in the slightest requests for names like dylan or clapton from mark, not even that mark was so busy for the musical, so much so that a few days later he attended a small event in Italy.
I have never cared so much about this museum in cleveland, dire straits and mark knopfler have received real recognition in other situations and above all from the endless audience of people day by day for years they have listened to that music considering it truly 'special'......