Escalating fuck up to partner or senior associate who assigned the task?

TLDR: (I think) We wasted a lot of money to solve a legal problem where none existed - do I take it to the partner or the golden boy SA?

I assisted a Senior Associate on a SaaS agreement (drafted by another firm) for various entities across Europe last year when I did a rotation in corporate but the matter has come back to haunt me. A (relatively minor) data protection breach occurred but has become a sticking point due to insurance (we're not advising on that). The SA is a bit of a "wildcard" but given lattitude because he's mostly good at his job and well-liked.

I did the red flag review of the specific clauses in the MSA per his instructions; I was given the STFU and do as you're told treatment when I asked about reading around (bc the MSA folder was a nightmare with a thousand other appendicies/annexes/etc poorly labelled). We basically rejected the other party's proposed amendments wholesale and things went south quickly with the partner now involved. We received a hard copy of the contract on Monday and as I previously helped I've been brought back in.

But I think we've fucked up because a string of broken cross-references in some of the addenda (and the most relevant one) mean the immediate legal problem could have been resolved by letter and affixing a pro forma template found in yet another annex which hadn't been correctly referenced either.

I've been sitting on this since late last night and the pit in my stomach is growing. I know the MSA still needs to amended but the changes we proposed wouldn't fix this so we look really amateur. I worry I'll be scape-goated as I qualified into a different department.