I really think the true value in an LRT like this is the practicality and predictability. I feel like a setup that uses shuttles to fill the gaps would make things unnecessarily complex, and time savings would be difficult to quantify due to the presence of transfers and dependence on traffic conditions, since the shuttle buses would need to enter mixed traffic.
Predictability and practicality are, in my opinion, the two most important factors in making transit a more viable option for people. Providing a single system that makes more stops, albeit potentially slower than one with less stops, will always be more superior and more attractive to one that requires more effort to use and more moving parts that can potentially fail.
Additionally, the purpose of a line like this, with lots of stops, is to encourage and entice developers and residents to build their lives and communities around it in such a way that produces a strip of development, not to serve and create pockets of density with commuter sheds and shuttles to fill the gaps. We already have the GO for that.