The factory boys seem to be allowed to do the Spanish multi-day events like Cingles and Santigosa but not the SSDT?

I would guess they are allowed to ride the SSDT but would assume it comes down to 'do they want to do the SSDT'

It is not really going to offer them (factory or riders) a WTC style trial due to section layout, rules, length of each day etc + and possibly most important at this time, it is a long way to go for the Spanish / Italian manufacturers and at a very big cost to them whereby the trials you mention are effectively 'on their doorstep'

Would be great to see a full quota of WTC riders there though!

The factory boys seem to be allowed to do the Spanish multi-day events like Cingles and Santigosa but not the SSDT?

Cabestany rode Scotland last year, and surely Dabill is a "factory boy".