Houseworth hasn't had a too much of a problem setting up Ben's bike in the two years at tech 3 and during the pre season testing. Obviously there was no data to go off of for the new format so everyone was starting from scratch but all evidence from testing indicates Spies was moving in the right direction and would be a challenger.
Tech3 was a different ball game - they had a few years into that bike and knew what to do to make it handle. Similarly, his first year at Yamaha they had a ton of data from all the previous riders to work through.
But this is a new bike, with new tyres. And they don't have any data.
That's where I think Houseworth is becoming unstuck. It's not that he won't get there, but the guys with 15-20 years in GP engineering are getting there quicker - specifically, the very tight and technically astute boys at Tech3.