All Shikoku Pass

We wish to travel by JR from Takamatsu to Matsuyama with one day stops in Iya Valley (Oboke) and Kochi. I think there is a section of track not owned by JR near Uwajima.? Is this route possible with the JR All Shikoku Pass?

Also, if we buy the four day pass, and take the train to Kotohira from Takamasu and return on the first day, then on second, third and fourth day travel from Takamatsu to Maysuyama, as described above, would this JR pass be economical (lowest cost)?

Thank you fro your assistance.

Wilf