Imabari was Japan's equivalent of what Concord/Kannapolis, NC used to be, the hub of the nation's textile industry: to this day, Imabari is primarily known in Japan for its towels, though as with Concord, that industry has moved overseas.
The only other reason to bomb the town would be because of the shipbuilding, but as far as I can tell there were no military vessels built there. (The company website is here.) Of course, Imabari didn't get bombed, and it continued as one of the places for shipbuilding during Japan's heydays in the 60s and 70s.
And how do I know all this? Because since 1995 it has been the sister city of Lakeland, FL, ten miles from my home. I wonder if it occurred to anyone in 1945 that such things would happen in 1995.
But as I typed yesterday (with incorrect times, for which I apologize), the bomb explodes over Hiroshima at 8 AM August 6, which would be 7 PM NY time today, August 5. More on this tomorrow...
One thing I wish they had added to the map of Japanese target cities was a 1500 mile arc from the air bases in the Marianas. 1500 miles is about the maximum effective range of the B 29 if its carrying any kind of payload. If you look at the string of cities (and targets) stretching from Yawata on Kyushu to Tokyo, it forms a line of cities, which is just inside that 1500 mile arc.