The discussion on pre-soak / not pre-soak will never get settled. Please don't open that can of worms.
Many people have fine results with pre-soak. Many other people have fine results without it.
Either way, the least of your concern are the dyes incorporated in the film. Whether it gets washed away prior to developing, during, or after, has very little effect on the actual film developing process. Just do it the same way every time, and STOP worrying about the color.
Tri-X will not have much color in a pre-soak, while TMax will. Ilford comes out clear, Foma/Holga/Arista.EDU Ultra comes out turquoise. Just don't worry about it. It's perfectly natural.