I'm passing no comment for or against what you've said here, but I did this little chart to kind of visualise the maintenance in the park, based on what was on their maintenance page, and other info such as school holidays and doomsday construction.
I haven't included fright nights or carnivale either.
There would have been room to fit things around a little bit but once you add carnivale and fright nights in it starts to get a lot more difficult.
I'm also mindful of the ongoing doomsday construction which - although outsourced - would still require day-to-day involvement from local crew familiar with the site. I think its been a very difficult year for them to plan.
Something that also sticks in the back of my head with my background is when we see storm season, and when weather can wreak havoc on things like paintjobs. Mid-september is the start of that season, and May-early June is also a bad time for rain events.
Looking at peak periods - it makes sense to close West throughout the winter holidays, but it would be suicide to close Superman. Superman went down almost immediately after holidays, and comes back up JUST in time for september holidays.
I'm not having a go - but what could you see done differently to avoid the 'two majors closed at the same time' ?