The Sheets Editor is the tiddler that edits all sheets.
Then, wherever we want to show the sheet, we transclude whatever tiddler has sheets data using the sheets editor as transclusion template.
The point of TiddlySheets is not to be a spreadsheet application, but rather to be something like TreeSheets: a way to enter information and organize (layout) that content with the help of rows and columns.
What I've quickly realized is that every cell can be more than just an edit text widget. Every cell can old content managed with any kind of widget, and any cell can also be a transclusion of content from some other tiddler.
So suddenly TiddlySheets has the potential of being a TreeSheets on steroids.
Even more interesting: TiddlySheets could be used as a Forms Creator.
Oops, I went off-track. Not sure exactly if I answered your question. Please let me know if I was clear as mud and/or answering a totally different question...