"Edmund Ironsides was suposedly murdered by Eric Streon who hid in the King's new toilet and stabed him in the bottom with a sword."
Streon appears in the (limited) chronicles as a complete opportunist, switching loyalties with little hesitation when it behooved him. Am I recalling correctly that Cnut did away with him? There is a passage somewhere about those who were faithful in service to aethelraed (during his interrupted reign) being generally left in place by cnut, but those that switched loyalties were not.
I think you are right. He was considered a dangerous opportunist and quickly dispatched.