Can I train 2 different styles of tai chi simultaneously?

Sifu Waller is a traditionalist and does not believe in form collecting or mixing styles/approaches. 

All of our material is fully integrated.

'Form collecting' is a modern habit which arises when a student is unwilling to commit the necessary practice to mastering one style of tai chi.
In short, the student gets bored.

Many excessively bounce around learning the next 'new' form or movement set without ever extracting the real internal value from any of them.
(Bruce Frantzis)