Like I said, I would probably notice more on repeat listens. Would say though that that's only about one third of the songs on the album. There's plenty of significant songs on this where he does not take a solo which is almost unheard of.
I have heard much more tasty stuff from JP on second run through though. Just getting up to end of Act 1 and am enjoying the album at least 3 times as I did on first listen. Three Days is particularly awesome, especially the "Bow down to Nafaryus" bits.
That part in Three Days is awesome, as is the ending.
What is interesting is of the 4 times Jordan has some sort of synth lead solo, 2 of them are on songs where JP does not have a solo.
I would say more than 1 3rd considering there are 5 nomac tracks. But I agree there are important songs with no real solo. There are only 1 or 2 places I really think a solo could fit though, a lot of the songs would sound odd with a guitar solo added to them IMO. Like Three Days for example, I just don't know where one could go.