

They are tied, because the other two freedoms are intrinsically linked to the first. If a thought is not permitted to be expressed, then it is, for all intents and purposes, prohibited.
Consider how often you forget something. I write things down to remember them. If that thought, expressed, were considered criminal, then it becomes a limitation also on thought itself.
Yes on all accounts - I think freedom of thought and expression are linked to a great extent. We form and develop thoughts and ideas by expressing and discussing them, especially when it comes to more advanced concepts that benefit from group insights.