No help with US Bank at all.
Chase MDD can be done at 4/24. I think that's how the original DD started actually, to grab two cards before officially hitting 5/24 (or really 6/24).
With the Chase 3 month guidance, that was in place to promote pacing to avoid a Chase shutdown. So generally recommended putting 2-3 months between Chase cards regardless of biz or personal. If you're thinking of breaking out of 5/24 then the general pacing of other cards matters less but when you want to come back Chase then you don't want your CR to look like a risk when they pull it. Chase historically hasn't been inquiry sensitive but seeing new cards close together and recently to your application can send up a flag. So I think it was also recommended to slow up in the 2-3 months before restarting with Chase again.
I believe this was
@SouthFayetteFan 's last thoughts on it. Since he's been following bustout risk shutdowns for a while, I usually look at his list of current recommendations.
https://www.disboards.com/threads/i...t-page-for-addl-details.3784063/post-61522461
Personally I'm not straying too far from 5/24. I'm not liking a huge gap of waiting. Last year I grabbed two personal cards within a few months of each other and then left almost a year gap before picking up 2 cards near each other again. This totally wasn't the plan but just how timing my spend worked out.
2/19 SPG (plain AmEx Bonvoy)
6/19 SW Priority
3/20 AmEx Green
4/20 AmEx Bonvoy Brilliant
So I'm waiting until next February for one to drop off once I hit 5/24. And then I have a 9 month gap. 9 months is hard, I like 6 better.
Flip side to that is load up all in one year so you have them all drop off near each other. Basically have a Chase year and a non-Chase year

I'm contemplating grabbing my 5th in the next month or so, so that in 2022 I have a string fall off at once. But if something good pops up from Chase after that I have another 8-9 month wait. So I might look at a non-Chase, non-reporting Biz card meanwhile (maybe something from AmEx) so I can get back to roughly 6 month gaps.
Eh I might be crazy but I don't go through spend very fast so I don't feel like I need to really breakout from Chase. If other banks are still "biz" friendly I might just tread water for now and watch where Chase goes.