Could you explain the multiple Caliborn theory thing?

Basically,  the theory is that the Caliborn we’ve been following in story isn’t the Caliborn that will become Lord English and is from an alternate timeline.  This Caliborn focused more on art and less on combat. This would explain why Hussie stopped talking to him abruptly and why the Caliborn in the masterpiece was surprised by things. Surely, if the Caliborn we’ve been watching who had seen the fight had been the Caliborn in the fight he wouldn’t have been surprised.  If Art!Caliborn was the Alpha!Caliborn then there would be stardust in the current post-retcon timeline as well, but we’ve seen no trace of it and John hasn’t been back long enough to blow it all away.