Our "out-of-sync" child...sensory issues

It doesn't take a rocket scientist to see that Brycen has many sensory issues. While Sensory Processing Disorder is separate from Autistic Disorder, most children on the spectrum have some types of sensory issues that fall under Sensory Processing Disorder. These two can go hand-in-hand, or one can be seen without the other.
I bought "The Out-of-Sync Child" book a couple months ago and have decided it is time to start educating myself on these sensory issues that Brycen is facing. This is one area that I really don't have much experience and will need to rely entirely on the Occuptional Therapist for guidance. His sensory issues have increased over the last year, and have been very noticeable the last few weeks. We all have sensory issues, but when it starts to affect your daily life and interfere with growth in other areas, then it becomes a whole other obstacle...which is where we are with Brycen right now.
His SLP spoke with me after his speech therapy this morning and said that his grinding is getting worse, which we completely agree with. She noticed when she had him in the swing, he wasn't doing it, but as soon as they transitioned out of the swing, he began grinding. She gave him a chewable toy, but he had no interest in that (just like he doesn't have interest in his chewable Thomas toys at home anymore...unless he is lining them up). So, she attempted to replace the sensory mouth issue with some other sensory input by giving him rubbery balls to play with. She said this helped out a little. The balls they use are actually chew toys for dogs, and that probably sounds crazy to some people, but they are very durable and have both the texture and smoothness that most children with sensory issues crave. The use of these will encourage him to squeeze them in his hand or rub them up and down his arms/legs to gain similar sensory input without the damage to his teeth.
This "talk" led me to call the doctor for yet another order to be faxed for therapy and we now have an Occupational Therapy assessment scheduled for next Wednesday after his speech therapy.
While beginning to read this book, I have found some definite sensory issues Brycen has in the following areas: "overresponsive" to sights, sounds, and tastes, as well as "sensory-seeking" to touch, movement/balance, and body position/muscle control. I'm curious if my understanding of this and from identifying these areas of concern for Brycen are similar to what the assessment will show next week.