why was the difficulty for seymour so inconsistent?

his first fight might have been a bit too difficult and time consuming(took me 45 minutes on my first run of the game, about 10 in my second run). Then there is seymour natus which was way too easy if you had trained on the highbridge for about an hour or so(slice and dice killed seymour and mortibody after 2 minutes of fighting ). Seymour Flux was a good fight though and his attacks did a good amount of damage to make it a challenge. But, the last and possibly easiest(if you got the celestial weapons, without it was still way easy) Seymour Omnus. I let it pan out because the music was great.

In summary, should the battles with Seymour have been a little harder?

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