There's alarm bells and then there's what's available to work with. Besides the Brazil game (up against Barbosa, Varejao and Splitter - no chance), the Argentina result would've given Brown (I keep calling him Barnes...) some confidence that they were moving in the right direction.
They probably figured Jawai was the man in the middle (I don't think Schensch in for Ogilvy would've changed either result to be honest) and that adding Worthington (with a bit of Baynes to provide a different option to Oscar) helped them there.
If Ballinger had opted out due to the new baby, it's likely that it was too late to bring in Redhage or similar. The other bigs were probably OS, Tragardh was only a late inclusion to the first camp I think, and it went from there.
End result was no good, but I can see how he got there.