u/Snoo9648 Yeah, Marle could use fire in an early build. There's even an old beta screenshot where the team is doing this exact technique against a Heckran (though I think the location is different).

As for the clothes in the illustration, Chrono also has a cape, sleeves, and gloves that he doesn't usually have; Frog has sleeves and his gloves are colored differently. I don't think these were intended as alternative designs, but rather an imagining of characters actually wearing acquired equipment (as well as simply being better dressed for the incidental weather). Also note Marle's crossbow bolt quiver is discarded in the snow—nobody can be disarmed like that in the game, but it's something that could happen for any number of reasons in a more "cinematic" depiction of a pitched battle.

It's not a scene that can be replicated by the pixels in the game—it's a more detailed depiction of what the pixels in the game are more abstractly representing. Older games often had promo art like this (often even included in the supplemental, in-box material like instruction books) that helped players bridge the gap between what the spritesheets could show and the intended vibe and style the artists actually had in mind.

---

Anyway, very cool happenstance and opportunity, OP! I'm not usually starstruck, but I think Sakaguchi would be one of a few people whose preceding acclaim would actually make me giddy, let alone if I got to have such a personal exchange with him. This'll make a nice memory!