After reworking on my tone, I realized it was all air stream.
I used have a subtone-ish dark sound which I was quite satisfied with.
But after repairing the horn from a damage, the feel changed a bit and I was not able to get the tone I used to have.I kept doubting the horn for a while but finally gave up and play the horn as it is, and rebuild the tone.
I worked on my breathing, embouchure, and all the things I can imagine for the tone.
The most confusing part was how much mouthpiece to take in.
I started by taking in a lot of mouthpiece which was suggested on the Phil Barone sticky. The sound was horrible and stayed horrible.I concentrated too much on 'taking in a lot' and was not able to see the meaning of it.
Now I became able to use the air stream and by that, the other things (how much to take in, embouchure)does not matter much, it effects the color of the tone but does not make it weak or bad.I can produce a tone with a lot of mouthpiece,less mouthpiece,bottom lip curled in,curled out,double lip etc,with a satisfied tone.
So what I want to say is, there is no substitute for the air stream.
How much mouthpiece to take and embouchure varies by people so those things are flexible if you have a good air stream. But without a good air stream nothing is going to work.
People having a hard time on embouchure and other things rather than the air stream might want to check your air stream once again.If you become able to use the air stream everything is going to be easy.Way easy.
Hope this helps sombody.