Sorry if it is a dumb question, It was a while ago i took physics, but isnt it a rule of the electromagnetic field that for any closed surface the electric thingy leaving through the surface is proportional to the enclosed charge or sth similar. If it is true, the uap standing still could only exists if a charge (ie, matter) is enclosed there. Which means that the field-animal contains matter which means they lose a lot of nice properties you outline (fast travel, evolution, etc..) which makes the theory less probable imo.
Sorry if it is a dumb question, It was a while ago i took physics, but isnt it a rule of the electromagnetic field that for any closed surface the electric thingy leaving through the surface is proportional to the enclosed charge or sth similar. If it is true, the uap standing still could only exists if a charge (ie, matter) is enclosed there. Which means that the field-animal contains matter which means they lose a lot of nice properties you outline (fast travel, evolution, etc..) which makes the theory less probable imo.