and your logic fails at one thing. it's not like you choose someone to host a Bijuu by his/her abilities. take Yugito for example, what would happen if her element was lightining? Nibi uses fire element so this would mean that she couldn't use it's power? i mean, if they have different chakra natures there wouldn't be anything to increase.
but you're not completely wrong. Jinchuurikis are able to have a better control of the Bijuu's abilities making them stronger than if the demon didn't have any host, just like Deidara mentioned.