The ending doesn't make sense? Spoilers Farseer & Tawny Man

[Farseer]

It wasn't an ending to me, and could never be as long as Changer was alive...as Fool himself attested, Fitz was and always would be the catalyst.

Hey Nuytsia. Just found the passage from where I got my info for this old post and why I agreed with Witted Bastard...it comes from Chapter Thirty-Four in the UK version of FF, Commitments pg 729:

Fool says to Fitz, "You are still the Changer, still the Catalyst. Even in the short time you were at Buckkeep, you've proved that. Change is swirling around you like a whirlpool. Restored, you no longer flee it, but seem to attract it. And I, I am blind now, when it comes to seeing what vast changes my influence upon you can cause. So...I will not be coming with you."

Not only does this passage tell us that Fitz is still Changer but his power as the Catalyst is even greater than ever before, after Fool's restoration of him. It also clearly tells us why Fool felt he had to leave.