Each sermon in the series went through a familiar (or not) Old Testament story and showed Christ through each of them....
Not sure, wasn’t noted on the website.
I suspect Tchividjian was influenced by Keller.
Also this is the type I message I have come to expect and am finding it more and more commonly delivered in Reformed circles.
The copyright notice on the page at the link is 2013, so it looks like it would preceed TT’s sermons.
I’ll have to say that I’m not a particular fan of either Keller or TT. I’m more inclined toward Sinclair Ferguson/Ligon Duncan/Richard Pratt.