Overall do what's best for the cast, JP and for business.
However, I want to look at the logistics of this logically.
We know a weekday time slot is locked in at 9-1 eastern. Mondays could interfere with early access to midnight game releases for JP, but perhaps that's nitpicking. Thursday goes head to head v. Critical Roll so no go there. Friday - doesn't Zeke do a comedy thing that night?
Wednesdays could work, but that requires Zeke shutting down his stream for an entire day to make content for JP. Seems unreasonable but not up to me.
I understand the desire of weekends especially for the EU crowd, but I truly fear weekends particularly for the Blades cast. Already in the shout outs last night Geoff mentioned Warhammer on weekends next month. Thinking more long term through the year, how many events are Zeke and/or Wheat going to be working/hosting for twitch. I don't just mean PAX x3 + Twitchcon, these events usually are Wednesday-Monday with travel for Zeke in my observations.
Since the main purpose to move Blades to weekends would be to appease the EU crowd for live viewing, it's locked into a 3pm or maybe 5pm eastern start time and that's pushing it perhaps. Is the cast okay with Noon local starts eating their every Saturday afternoon? Everyone must remember and consider WM had a rotating cast for the most part, only JP and Steven were required to consistently give up their Saturday, which is when "normal" people like to schedule family social events with us nerds. How does the weekend time conflict with potential one shots and guest scheduling? Maybe it doesn't, not a question for me.
My fear is a weekend time slot leads to more canceled shows than actual shows or an inconsistent day if we're lucky enough to get make-up dates which isn't the best for viewership growth.
As for solutions. If they must be split, I'd consider keeping Blades Tuesdays 9-1 and moving CoS to Thursday 4-8 pm. Stays away from head to head v. Critical Roll and Co-op for those crossover views of each, but puts shows 3 days in a row for JP with one show still in the pipeline. Is he okay with that against his regular stream? To fix the EU Blades issue, I don't know. My only solution is a business model issue for JP, but running an Encore Presentation, a rebroadcast if you will of Blades at an EU friendly time on Sat/Sun is my only idea. It's not live, but if all of EU watches it, the live chat room feel maybe helps as a meet in the middle kind of way? I don't know, not a chatter so can't say.
That my input trying to be logical and looking at it from a different point of view.
Best of Luck.