Yeah theres no way that many people would like up like that especially when there is so much space to the right

I just did your route out according to the timetables and am getting a extremely optimistic time of 7:19 assuming running everywhere and no delays or missed connections.

I would argue that bike sharing constitutes public transit, but alright.

Fair enough, though it very much depends on the timetables and if you start later in the day you can get it to line up alright so the wait isn't long.

Also, I was wondering in general, is it considered cheating to use bluebikes between stations? There aren't any official rules, at least not publicly available.

Also I was taking the commentuter rail from jfk to Braintree, then all the way to alewife on the red line

Yeah that's the obvious choice but taking the commuter rail from jfk isn't that much time and getting anywhere from oak Grove takes forever. And the time between Riverside and Brookline village isn't that bad, the majority of the wait is in the central section in of the green line

I was thinking about doing that too, I'm impressed that you managed to route it 7 hours exactly, the lowest I could get theoretically was 7:20 starting in oak Grove and ending in wonderland

Get a folding bike, or get a cheap bike you can lock up at your home station then use bluebikes when you get into the city.