Your former statement is what I would expect if they are installing multiples of high volume equipment in the bottleneck zone. If they have 1,500 units worth of equipment coming in and blitz install it, then there could be a large jump. If each piece of equipment is good for 250 units per week and they have a staged install schedule, then you might get the smooth ramp.
Lame analogy:
Family one:
no kids, year later: one kid, year later: two kids, year later: three kids.
Family two
No kids, year later: no kids, year later: no kids, year later: triplets. (less likely, but possible)