So Jim said that Carlos is the type of wizard to beat Harry. The fencer vs the weight lifter. I know Harry has gotten some grief for his magical abilities, relying too much on pure power vs skill. I will say though that Harry can absolutely beat wizards who have better magical talent.
Dresden over the years has become a battle hardened fighter. He's been beaten to the point of near death. He's faced magic, guns, hand to hand, and other various combat. He's often on his own, with little backup. He hasn't had wardens by his side helping him face these threats. He's been on his own for most of it, outclassed, and relying on pure grit to survive at times.
He's had to rely on more than just magic. With all that he's learned I think he will combat other wizards by taking them out of their element, and using their instincts against them.
For example I see Harry using the Marcone approach. Marcone had crafted bullets meant to punch through a wizards shield. I see Harry (who is an expert in crafting magical items) using a wizards instincts against them. Harry is losing fight, pulls gun other wizards inner dialogue "how pathetic", raises shield, enchanted bullet strikes shield, sending surge of power that travels through the wizard, horribly injuring them, but not killing. Or his bullets may be similar to Lucio's swords, traveling through the shield.
Carlos reminded Harry that wizards don't fight fair, and I think Harry will probably say those exact words to Carlos after beating him someday.
Eb might be a different animal altogether. He's been fighting for centuries and probably knows every trick. Still, he's a wizard and has grown accustomed to fighting a certain way. Harry might use something more modern to catch him by surprise.
I guess my point is that Dresden understands his own limitations, and as Worf said on Star Trek when you're outclassed, and outgunned all you got left is guile. Harry has fought the nitty gritty. He knows what he can, and cannot do, and because of that he is a bit humbled by others abilities. He knows Carlos is better on a technical level. He won't face him on a level playing field, won't fight to Carlos's strengths. He will exploit his weaknesses.
Now that Harry is out of the White Council, and knows they may be targeting him, I expect Harry to prepare for it. Before he always had the Council to fall back on as a last resort. No longer. He knows they may be coming for him, and he will arm himself accordingly. I expect to see an improvement from him, some new tricks, and some new tools
