Your answer is in your own thread Mr Mystery, however perhaps your strategy is still viable. If you deploy your drop pod as close as possible to rip tide and disembark in a line at max coherency around it eg X (o, {where X is droppod, ( is a line of sternguard, o is riptide} then not only would he only be able to get 5/10 of them at a time but he's going to be hitting himself, plus if it does scatter even a few inches he'll only get a few models.