I can't speak of the state of the defense that year, mainly because I don't remember but Vlasic caught many unawares. I don't believe there was a spot for him to fill, he took it.
the sharks training camp roster.
mathieu biron
matt carle
rob davison
james delory
christian ehrhoff
jim fahey
scott ferguson
josh gorges
scott hannan
derek joslin
randy king
matthew mccue
kyle mclaren
doug murray
graham poteur
dan spang
garret stafford
brad staubitz
patrick traverse
vlasic
ty wishart
of those defensemen, players bolded were players coming back from the previous season. 8 players were coming back to start the season, until fahey got traded which opened up a spot on defense for vlasic.
of those 7 returning players only 3 of them had more then 82 games under there belt. those 3 players were scott hannan, kyle mclaren, and rob davison. most of the 4 other returning players had at most 40 games under there nhl careers.
at forward it is near impossible as it is right now to crack the line up for any one. since every one of the 14 players signed other then hertl and nieto (but i think it would take a mirracle for any of the rookies to beat those 2 out) are basically nhl vets with well over 200 games played.
sure at defense there is 1 spot open, but that doesn't sound to much like a youth movement to me.