if i can ad my two penneth worth, we have two issues here, 1 to kill the tree and its subsequent suckers...then 2 is how to remove the dead stump.....you have had some good ideas here.......kill the bugger first, then grind it out......ripping it out could cause allsorts of trouble with structures around the trees....grinding should be able to take it 2 feet down, you can help rotting by appling septic tank mixture or dried milk powder to the remainer of the stump if there is any left...a goodgrinder with the right kit should have them out no trouble.....the cost is another thing...good luck