As far as Captain strength in, comparison to god, goes have you considered making them as powerful as your average god/goddess, but their power is cruder for a lack of a good word.
In other words they can get way up there and be equal in sheer power, but it can't be used to do all the things divine power can be used for, altering reality for example.
This could be what makes the Hogyoku so dangerous because when a Shinigami uses it it converts their power to Divine/Infernal and then you start to have gods/goddess running around without a checks or balance system, and it gives weight to Aizen as a threat.
Also I don't really like the thought of Ichigo going Vizard in this one, seeing as Belldandy is his mother I hardly think she's going to stand by and let him do that to his own soul, instead I like the thought of him slowly learning to tap into his Divine powers until the end of the story, which could go either way on this subject.
Remember that when it gets harder to make two universes fit together it just means you have to go a little bit further off the beaten trail.
In other words they can get way up there and be equal in sheer power, but it can't be used to do all the things divine power can be used for, altering reality for example.
This could be what makes the Hogyoku so dangerous because when a Shinigami uses it it converts their power to Divine/Infernal and then you start to have gods/goddess running around without a checks or balance system, and it gives weight to Aizen as a threat.
Also I don't really like the thought of Ichigo going Vizard in this one, seeing as Belldandy is his mother I hardly think she's going to stand by and let him do that to his own soul, instead I like the thought of him slowly learning to tap into his Divine powers until the end of the story, which could go either way on this subject.
Remember that when it gets harder to make two universes fit together it just means you have to go a little bit further off the beaten trail.