Depends. 42-47c gravel tyres are not the same as a 2.4" MTB tyre. A 120mm suspension fork isn't a rigid carbon one.
Suggesting a 150mm trail bike just because it's furthest from his gravel bike is a bit silly if he plans on riding it on 1000km ultra races where speed, efficiency are key and there's a distinct lack of jumps and hucks to flat.
Depends. 42-47c gravel tyres are not the same as a 2.4" MTB tyre. A 120mm suspension fork isn't a rigid carbon one.
Suggesting a 150mm trail bike just because it's furthest from his gravel bike is a bit silly if he plans on riding it on 1000km ultra races where speed, efficiency are key and there's a distinct lack of jumps and hucks to flat.