There wasn’t much enthusiasm for the Confederate cause in Northern Alabama. Many of the Confederate soldiers from that area were resuctant conscripts enrolled under the oppressive hand of the Confederate state administered by often corrupt and sometimes outright criminal local Confederate power structures. The desertion rate of such conscripts were high and in the end it was crippling to the Confederacy.
I'm not seeing it there. I'm sure there were Union sympathizers, just as there were in Georgia. But I don't see any sign that their numbers were significant, let alone "crippling to the Confederacy".