I hadn’t heard about the divorce settlements but that makes some sense (although not sure how all three of them get a cut...) That said, I seem to recall that Blackmore recently said he cannot play guitar like he used to. Swollen fingers or something of that sort. Makes sense, he’s 75ish years old now, he probably shouldn’t be expected to be able to just crank out the solo to “Highway Star” like he did 50 years ago (yikes, it was that long ago!)
Following their divorce, Blackmore married Bärbel, a former dancer from Germany, in September 1969 until their divorce in early 1970s.
Blackmore met Amy Rothman in 1978, and moved to Connecticut. He married Rothman in 1981, but they divorced in 1983.
So, basically, everything up to but not including Perfect Strangers was up for grabs as part of his divorce settlements, including Rainbow income. It's also possible the Rothman settlement included future DP income, in which case it's easy to see why Blackmore's Night is his primary focus (notwithstanding his health).