Let me rephrase. What I'm interested in is what was the cost and time difference in quotes from Suffolk vs the other handful of contractors that are all actively working on MBTA contracts? Why add it as an irrelevant change order to Symphony Station vs the others ongoing? I'd have to imagine the mason, electrician, etc. are still getting the same state-mandated prevailing wages, so in reality the only 'issue' is the competitive bidding process, which is to ensure that bids are reasonable (profit not excessive) and that the MBTA is fair in how work is distributed (not favoring specific firms, etc.). It's a fairly easy documentation to show you had the taxpayers interests in mind. Could even be a one page memo.
I mean, reading the actual letter the AG wrote -
LINK to actual letter being referenced - that is exactly the point of the complaint - the MBTA awarded it to Suffolk without any competition at all, without soliciting additional bids from any of the other contractors.
... other CMR firms were not provided an opportunity to compete for the Foxboro Project. Second, it remains unclear whether the MBTA obtained CMR services for the Foxboro Project at the lowest rate competition among responsible contractors could provide because the MBTA only received pricing from one CMR firm, Suffolk.
That's kinda textbook circumventing the public procurement process - there are no additional proposals from Consigli, Middlesex et al for the T to put in that memo, because the T didn't get that from them. Why this Suffolk symphony contract, and not ond the on-calls or other contractors? Kinda the point of why you're not allowed to do this by change order. Apparently, someone only told the T they would have to move more than 4000 passengers this February, despite having been selected as host in 2022, and the planned improvements scheduled for 2027...

Either way, T apparently couldn't get through a full new public procurement that fast, which given the multiple multiple week processes... is facially plausible.
(In terms of numbers, the T is paying some additional 14.8M to Suffolk to actually build the station.)
The risk here is that the complaintant to the AG is one of the spurned contractors, who could litigate and force an injunction to stop work, on the basis of this AG ruling - they specifically declined to rule on merits of the claim that the public interest is in the change order being allowed to stand on the basis that there isn't any ongoing litigation.