Random question on a lazy afternoon

If you walked the Viejo from Pamplona to Aguilar de Campoo to join the Olvidado, and then later joined the Salvador at Buiza, that would only give you about 172km / 7 stages on the Olvidado itself. Would that be 'enough' Olvidado or would it be a shame to miss out on the stages before Aguilar and after Buiza? I have the impression that this middle section is the best of the Olvidado's mountain stages anyway, so maybe it is enough. Thoughts?

Or maybe a better way to put it: to reach Aguilar de Campoo, is the 'better route' (in the eye of the beholder, obviously!) the Olvidado from Bilbao or the Viejo from Pamplona?