You don't have to shout at me...
To answers your questions:
- What does a lead player sound like, is there a rule?
Listen to the great leadplayers to get an idea, but to help you I'll give you an idea. The leadplayer has to be heard by his section members, the rest of the band and the audience. They have to blend with their section and the sound should not just be out front but also give enough feedback to you and your section members. So everybody hears what you're doing. Leadplayers have a brighter sound with some body, so it's a fat sound with sizzle on the high notes in the tuttis. The sound has to project but also has to give enough feedback. If you don't get enough feedback, you will overblow in tuttis because you're not hearing yourself enough.
- How does th B993 sound in front?
Fat and with a wide spreading sound. The audience will hear you I'm sure. But I'm afraid they won't hear a complete section, but a leadplayer and the rest of the section. It's more or less the same if a leadplayer plays a Connstellation and the rest of the section plays Bach. It doesn't blend that well.
- Who should benefit?
A good leadplayer with the right equipment will please everyone.
I'm just giving my thoughts on your dilemma. I'm a prof. leadplayer and had a B993 which I liked (and played enough concerts on to give some advice) but sold it because it didn't work out for me. I could play lead on it but it wasn't the best solution for the job. I'm not saying a Bach is a the best solution either because there are many good (lead)horns outhere.