We would be insane to not speak to someone else.
The Sherwood appointment seems to have happened mostly because we were caught with our pants down by AVB leaving, the club would be in purely amateur hour mode if we haven't spoken to multiple options both before and after appointing TS.
I agree with the before part and maybe that is the reason they haven't spoken to anybody in the "after" part. It may be they got an provisional "yes but after the end of the season/WC" from their first or second choice and TS is plan B / C / Z in case it doesn't happen close season.
We can only pray that is the situation.