Very odd. I had my money on whiskey being the best character for a speed run in the rogues.
I think however you are underselling marquis. I very rarely need to worry about being alive as marquis. Only until I reach aria does my chances of dying go up. And in a solo run brutes are quite scarce when fighting aria. And with the right specing I can one hit a gunner with a body shot faster than I think Toby could. Houdinis also cool down quicker than the mine and I can just drop one on an anchor spawn before the anchor arrives. I think for the majority of challenges both characters are on par with each other but I think I can traverse the environment in a more timely matter and be mobile while gunning
I personally just don’t see Toby performing better than marquis in a speed run