I agree completely that it is was a mistake not bringing in another striker but, of course, that depends upon whether or not a suitable one was available at the time.
BUT, whereas he perhaps was aware that BZ might not be available for even 30/40 minutes per game, something has happened to...
Sorry to suggest this but, if scouting reports show him as an excellent right full back who can go forwards, perhaps not a bad shout especially as, despite his fantastic season, Bruno is getting on a bit.
Better to prepare for an eventuality rather than have a situation suddenly jump up and bite.