Difference between Laytheme an Laygridder?

[ellusion]

Hi All,
Just found this awesome theme/plugin.
I'm a designer (and former front end developer) looking to create my portfolio site.
Now I have a question:
What is the difference between LayTheme and LayGridder.

I get that I get a lot more with laytheme than just the Laygridder element.
But when I buy the Theme is the same plugin as laygridder separate included?
Moreso, if I decide to (re)code my own theme can I still use the LayGridder plugin or do I have to buy it again as a standalone plugin?

I would like to customise the Theme, use it as a start but maybe it's just to complex
and I would like to just use the LayGridder plugin, would that be possible if I buy LayTheme?

Hope to hear from you soon,

thanks!

Mark