WATTAHACK
Granted, this is not very surprising given the foreshadowing preview chapters for the wedding. But I feel there were a few steps and build up that would have fit more in between to really establish or finalize either the five parts of one whole, or interchangeable but still unique. I have no issue with Yotsuba win, but either way the progression from confession to dating to proposal to marriage was nonexistent. That progression would and should have truly developed and expanded upon the five part bride. A confession of love/to date does not a bride make.
This specific chapter was probably planned early on, but editors or fan reaction fucked up the roadmap, ending up with needing to fuck shit up with the pacing and planned/intended arcs.
Edit: Not to mention how rushed and hacky he dropped that fucking huge bomb about Fuut's mom.