I'm kinda confused by what you are asking, but I think you want to know about bottling from primary.
The problem with bottling from a primary or secondary instead of using a bottling bucket, is that since you have patiently gone and let your beer settle and clear, in order to mix the priming solution and beer effectively, you would have to stir it in the carboy which would a) kick up all that nice sediment you have patiently let fall, b) possibly oxydize the beer.
It really defeats the purpose of both a long primary/no secondary or a secondary if you have to stir up all the nice sediment you patiently waited to settle just so you can have consistent carbonation.
If I've waited a month for extremely clear beer, why would I then mix it all up again to mix the priming solution in, when I can easily mix it in while I'm also racking off the yeast cake which I patiently waited to drop and tighten?