You are on the money; this appears as a ‘throw’. Assault spraying was distraction for bigger bombing.
There is also credible background chatter that Antifa-MS-13-BLM were in on it. People don’t realize that each of those groups are trained in terrorism, MS-13 especially.
I have a theory...just my own based on the ISIS claim and his foreign contacts and travels, that he and his accomplices were attempting to join their Antifa-BLM-MS 13-anti-Trump leftist terrorism with Jihadists and ISIS. They wanted to create an alliance of evil to attack and eventually take over America.
Just my own wild ass theory. But I think that’s what’s coming.