Collect signatures on them all
You are not required to file all of your recall petitions at once. Go out and get the six councilmen and one mayor recall petitions signed by at least 471 registered voters. File the three councilmen and one mayor. If you have four remaining councilmen then David will control the votes. It takes FOUR votes to pass anything the other three can't pass gas without David Shaver voting with them. So they must find some one that David will vote for. Otherwise if they stall David you submit the remaining petitons. Seems simple to me.
You are not required to file all of your recall petitions at once. Go out and get the six councilmen and one mayor recall petitions signed by at least 471 registered voters. File the three councilmen and one mayor. If you have four remaining councilmen then David will control the votes. It takes FOUR votes to pass anything the other three can't pass gas without David Shaver voting with them. So they must find some one that David will vote for. Otherwise if they stall David you submit the remaining petitons. Seems simple to me.