Board Thread:General Discussion/@comment-32550145-20170924014826/@comment-29707934-20170924020256

There isn't really much more to say about this topic. All that's said in the manga is that Incursio is the prototype for Grand Chariot. However, that just means that both are the same "type" of Teigu (both are swords transforming into armor that increases the user's physical abilities). Apart from that, there is absolutely nothing to suggest Grand Chariot is also made from Tyrant. For reasons you already stated, it wouldn't make much sense. Grand Chariot looks different and doesn't have Tyrant's typical abilities such as evolving and camouflage. It also makes little sense that such a connection is never touched upon. Grand Chariot and Incursio are similar because Wave is Tasumi's foil, the same roughly applies for Akame and Kurome and their Teigu. Their's nothing to suggest any connection beyond that, and given Wave's character and Grand Chariot's design it makes more sense to me that it was based on some aquatic danger beast. That's just a guess though.