Earnest, as you say, the possibility exists. They do emphasize that the risk is not increased by those that have recovered from Covid infection, meaning they can still contract myo/pericarditis, but within nomal parameters. If the myo/pericarditis is caused by the spike protein, it is part of the virus and manufactured by the body after the vaxx. Then both would have the potential to cause myo/pericarditis. Here's dr. Peter Mcollough, an authority on the subject. Interestingly, they want to take his medical license away for speaking the truth.
https://twitter.com/Jennifer_Arcuri/status/1588932544787263488?s=20&t=RBQoHTvdhuwNP4Bhq9mePQ