Yes that is our plan, has yet to be required.
The 50% isn't doing you any good shallow, might as well be on backgas. And at least for multi deco gas this is what happens anyway (i.e. the 30ft stop is the backgas break before going to O2).
This approach is also consistent with the absence of adjustment for pressure gradient offgassing stops (20-10ft) should you run out of 50% for whatever reason.
I have no idea how you'd adjust the O2 time for GUE's approach of doing 75% of the time (each) for the 70-30ft portion of the deco on 50%. Or how you'd adjust the shallow time if you only had 50% for that matter. Although in a snese its similar to the approach I described. 75% of deco on the gas, 1/2 of 75% = 38% via the backgas while you buddy does the time. Sum = 100% of deco for the stop completed. Our approach gives you 150% of the deco completed for each of the sharing stops then some slight de-crediting of the shallow time where only backgas remains.
In T1 was <taught> to double the deco time and reshape into an exponential curve. This is obviously ignoring the option of sharing and totally goes kapooy for multi deco gas dives, so it seems like a poor strategy.
Sharing deep where the shallow EAD of 50% does you the most good in consistent with how we switch to backgas shallower on multi deco gas dives and how you can finish the shallow deco on backgas if you should run out anyway.
Even RossH has agreed that deco really comes down to time waymoreso than shape. I am not concerned about having 0.5x extra (my time on backgas while you do your 50% time) for the 70, 60, 50ft stops and then being on backgas for the 40 and 30ft stops (or all the way to the surface if I only had one deco gas).
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