My original post centered on Sarilumab issues with the FDA.
Now there seems to be drift in scope , so here I go.
Successful organizations require forward thinking, planning, competence (aka, direct experience in all roles except entry level) and above all, ACCOUNTABILITY.
REGN financials indicate healthy cash flow, improved operations and growth/ CAPEX. Given the cited manufacturing issues with "fill and finish" at Sanofi, it makes sense to invest more to vertically integrate REGN operations.
Keep in mind Payor transactions focus on finished product, not drug substance. It also appears Regeneron holds no capacity to further process DS and hence the problem. A RCA is required and may indicate REGN leaders ability for forethought, competence, planning and hubris. Only time will reveal ACCOUNTABILITY.
Sanofi just came out ahead (reduced risk ) in this deal due to other DP franchises that fund their growth.
Btw, terminal failure is by no means redundant as perpetual success will be.