I always felt they did a weird thing with Alexis's duels, honestly. She's supposed to be one of Jaden's equals early on, but her fighting style in the anime gets softened so much. She uses Cyber Angels, right? In the manga, there's a sharper edge to it—it's still a Ritual-based deck, but the combos feel more decisive. The anime makes her duels more about support and defense, like that whole thing with the Cyber Tutu and protecting her monsters. It shifts her from a potential rival into someone who's often reacting to the plot instead of driving it. She's brilliant, but the duels rarely let her be the aggressive strategist.
Maybe it's because they had to fit her into the 'female friend' role more than the 'duelist' role after a certain point. Watching her duel Sartorius, though, that was a high point. She was using her deck's mechanics to break his prediction lock, and it showed that analytical mind she's supposed to have. They just didn't sustain that energy for her consistently. By the time the Shadow Riders arc wraps up, she's mostly cheering from the sidelines, which is a shame because her deck had way more potential for cool plays than we got to see.