Sure it's possible. However, I forsee this as being the next fashionable catch all in court. "Isn't it possible Sir that these 5 points of origin could have actually been 5 aeresol cans exploding and carrying mineral spirits to 5 different locations"?. To use a line from Lord Avato "Counselor, .......(thoughtfully) it's possible that the fire was started by a Martian Ray-beam, but that is not what the evidence shows in this case".
Oh well, If investigators on the criminal side do their job properly, this catch all can be overcome as well......
Dan Hebert (aka Heenan)
Retired ATF-CFI
Forensic Investigations Group
IAAI-CFI/ECT/CI/
EIEIO