Good point! Yeah, there are definitely people who have coins that are eligible for the second shielded petition but not the first (including the Zcash Bull Whale), and I’ll bet some people who petitioned in the first won’t do so in the second for whatever reason, and I’ll bet some people will petition in both. I myself will petition in both.
I guess it is analogous to how some people vote in Zcash Ad-hoc Council and some people vote in the Brazilian community and some people vote in both. (Looking at Alternative Dev Fund Sentiment Polls - #37 by aquietinvestor .)
How are we to interpret them? I don’t know, I just figure they will show us interesting data about what people will call for then can do so anonymously on-chain but they have to use their ZEC to do so…