28/08 Indices, page-156

"The XJO daily chart does open at the previous days close and there are no gaps on an XJO daily chart (evidenced by chart below)."

Pathetic.
This is a forum of Index Traders (allegedly).
You cannot transact the ASX200 at the open for the same price as the previous day's close.

Index leads, ETF follows. Always has been, always will be.

In this particular case, XJT (not XJO) leads, STW follows.

You should not be in the markets.