[Searcher]

I don't think aizen analyzed Orihime's powers, he didn't have the time to do it.
I just think that aizen has a clue but nothing more, besides how does aizen know how strong Orihime's power can be.
We know that she must be powerfull, just like Sado, otherwise I will be bored everytime ichigo has to save everone and everything.

And having sealing powers is not the same as having a offensive power.
What is Orihime going to do, seal the fights everytime.

Training with rukia is not the same because their powers are completly different.
Don't know if shinigami training methode is the right training for Orihime.

And if urhara did know something about Orihime's power then he would have said so.
But he doestn't know about her and sado's power, although training sado is easier, hell, he didn't know how to deal with ichigo hollow side.