@Crimson Lion Also a valid point. But consider that I only ever use the term "strategist" to describe Tsukasa. I've always written characters with the assumption that Strategists and Tacticians were two completely different things. Essentially, Tsukasa is a Strategist, but Keiichiro is a Tactician.
Strategist: Tends to look at the big picture and makes long term plans based on said big picture. They plan, they calculate, and they usually set things in motion from behind the scenes.
Tactician: Rather than focus on the big picture, they'll zoom in on one specific goal or objective and then find whatever ways they can think of to achieve that objective. They may not always plan or even calculate, but they
do think on the fly and can make judgement calls in the heat of battle.
It also comes back to the difference between being
smart and being
clever... or Intelligence vs Wisdom to put it in D&D terms. Tsukasa is smart (high Intelligence) but Keiichiro is clever (high Wisdom).
At any rate, there really isn't meant to be an objectively "strongest" member in Team Chaser. They're more like equals, skilled and useful in their own ways and in their own areas of expertise. Well anyway, it's not important in the grand scheme of things.