grammar - Can we have two thematic は particles in a sentence?

Good afternoon all,

From what I understand, there are two types of は-particle:

1. 
   

   The thematic-は (topic-marker) which is used to introduce things into the universe of discourse.

   
   


2. 
   

   The contrastive-は.

   
   

jkerian states that:

There can be only one thematic は in a sentence. If you see a second one, the second is certainly contrastive, and the first might be. (source)

But Derek states that:

The [non-first] は often adds a hint of comparison or contrast. (source)

These two sentences are contradictory.

Assuming that jkerian is right, that there is only one thematic は in a sentence, so the non-first は will always add a hint of comparison / contrast, which contradicts what Derek said.

Assuming that Derek is right, that it is possible for the non-first は not to add any hints of contrast / comparison, then it suggests that we can now have more than one thematic は in a sentence, which contradicts what jkerian said.

So basically I was wondering who is right? Is it possible to have two は-particles in a sentence, both of them not having any comparative / contrastive hints?