Bill - certainly not saying you are wrong. There's a good argument for that position being technically correct. But I will say this - in a prior life with an insurance company, that company and many, many others didn't agree with what we termed "The Holland approach." As far as I know, Holland's interpretation was never adopted as official policy by the IRS, and I never saw imposition of taxation in that situation on audit where the 2/5 rule had been utilized. Maybe just lucky...
Of course, I've been out of that for a long time, and it may have changed. I thankfully no longer deal with these issues, and I don't miss it!!