That's a lot of deduction then. Signamancy theory aside, Janis knew both Sizemore's level and CWL bonus independently.
After tBfGK, Janis notes that sizemore gained 2 levels since their last encounter. At this time Sizemore had Parson's CWL bonus. Later, during the battle for jetstone, not only does she notice the the changed CWL bonus, but Sizemore reacts almost shamefully, as if its a fact he knows she can see. But she still has to ask if the new CWL bonus is parson.
If all one has to work off of is deriving another stat, the math gets complicated, is the unit a level 5 with a cwl bonus of 2 or a level 3 with a cwl bonus of 4?
This infers that wanda at least can see the units level, but that may be a function of either croakamancy or decryption(pliers attunement) required to reanimate a unit. But she expects that parson can see his level, and he's using his glasses to confirm her statement.
Parson CAN see upkeep, which also wasn't on the bogroll stat plate.