Somehow half is missing. Teaches me not to write form my mobile phone

The thing is:
Fluff describes a Furnace Cannon as usually with two barrels. It can fire and damage a large area or it can focus to almost guarantee damage but on a smaller area.
Tome that reads that a single Furnace Cannon barrel has Lock 4+, 2 Attacks with BTL 4. Two barrels have either Lock 4+, 4 Attacks with BTL8 or they focus the beams on a single area for Lock2, 1 Attack with BTL4.
The Incubus has only one barrel. This alone rules out the focused attack. But this single barrel is bigger than on the Ifrit.
So the Incubus' Furnace Cannon should have one of the following profiles:
Lock 4+, 3 Attacks, 1 Damage, BTL(6), Scald
or
Lock 4+, 5 Attacks, BTL(4), 1 Damage, Scald
or
Lock 3+ 2 Attacks, BTL(4), 1 Damage, Scald, Flash (because Lock 3+ seems to be the threshold to gain Flash with BTL weapons)