There always has to be a first !
Anyway, define a successful managerial career.
There are the elite ones over the years from Shankly, Ferguson, Wenger and Guardiola etc
Hundreds of others do a decent job with the tools (deck) at there disposal
If Doug is true to his word and wants a highly qualified "best in class" coach then 100% it will not be Lampard.
It will be someone already interviewed as Robins number 2 who we either couldn't afford or wanted a number 1 role.