Brigadier General Meadrey was quite the public figure. His fanatism wasn't a secret, and he even had a series of battles under his belt.
Hence, the General's abilities and character were available to anyone with the right clearance level. Needless to say, Khan was among them, and the short trip gave him the perfect time to study the data and potentially change the preplanned battle strategy.
Sadly, nothing peculiar popped out. Brigadier General Meadrey was strong and experienced but not unique. His fire element gave him access to many stored spells, making him an all-rounder in battle. From the reports, he also looked quite the capable leader, so Khan couldn't find weaknesses to exploit.
Lieutenant Dyester had reached the same conclusion before the departure, but Khan hoped his unique perspective would reveal different answers. That wasn't the case, so Khan could only resort to an overwhelming show of force.