Grand Duchess M's whole claim is based on the Bagration link, which has not been a ruling house for centuries.
As far as I know the rules of succession clearly state that an heir to the throne of Russia has to marry a member of a RULING family. The Bagrations were kicked out centuries ago. Or am I wrong ?
Heir doesn't have to marry into the ruling family,albeit he often does...Here is a quote from the other pretender to the Russian throne Prince Nicholas Romanov about marriages in Romanov family in which they followed Gotha:
"Russia, with its very Germanic notion of dynastic propriety, found itself accepting all the Almanach de Gotha rulings.
And so if some unfortunate Russian Grand Duke wanted to marry a Princess Obolensky, descendant of the Grand Dukes of Kiev, who reigned in Russia, at the time his Romanov ancestors were probably still lurking in the woods, draped in pelts or wading through the marshes of East Prussia or Pomerania, he would have had to change his plans.
That marriage would have been impossible, but an Austrian lady, say a daughter of an Illustrious Highness, Count von Harrach zu Rohrau und Thannhausen, lord of the county of Rohrau, Freiherr zu Prugg und PĆ¼rrhenstein, lord of Starkenbach, Jilenice, Sadowa & Storckow, would have been acceptable!"
Here is link for this quote:
http://www.nikolairomanov.com/doc/iv1pre/index.htmlP.S.Bagration family was a ruling one until 19th century and that was the reason they treated it something like "equal"...