I've found that it helps to think of Baron blade as a dark reflection of Legacy.
As the story has developed, he grows stronger and more and more capable. He starts as a mad scientist who relies on his minions and gadgets while attempting to keep his own hands clean...and then when that fails he tries again. Each failure (in terms of the story) just brings him back stronger and more determined.
Just look at the events we all know of:
Round 1:
Legacy goes after the Baron alone, and does poorly. BB figures out a serum to deprive Legacy of his strength. (as depicted in the comic)
Round 2:
Legacy comes back with friends (getting stronger). BB ups his game by attempting to pull the moon into the earth. He's not ready for the team, though, and is captured. (Base BB, where any level of team cooperation will lead to victory unless he gets super lucky)
Round 3:
Blade escapes prison, and sets up bombs across the city- forcing the team to dance to his tune. with no access to his minions, or his fancy gadgets, he cobbles together a death ray and is a force to be reckoned with. (Promo bomber blade, where you NEED teamwork or he'll put the hurt on you!)
It ends in defeat, but the Baron is learning, plotting, planning, and improving each time.
This cycle repeats again and again.
We know that at some point, (a version of) the Baron goes after Legacy psychologically by targeting his daughter (successfully), setting off the events of Iron Legacy. this could certainly be considered upping his game- in that he successfully killed young Legacy and broke Iron Legacy's mind.
BB isn't about being a tough fight at first. He's the most dangerous kind of villain, one who learns from their mistakes.