while 2 players have often be quoted as something Kings miss (stretch 4 and 3rd PG), I do not think those two needs are equal.
In the system where coach likes to have 2 ball handlers on the court and where Kings SGs (Ben, Belinelli, Anderson) are not good ball handlers, the need for the above average 3rd PG is much greater.
There is also that little thing of both our PGs having injuries lately.
If we are all in this year, we do not want injury to either Rondo or Collison to leave us with Stockton and likes as a backup.
In the light of that, upgrading 3rd PG from Stockton to 1 year of Chalmers (for second round pick or less) might not be as expensive as it looks.
Regarding stretch 4, it looks more like a luxury to me.
Defensively we have WCS to take care of opponents stretch 4s.
Offensively, theoretically that could help Cousins... but Cousins was doing fine without stretch 4 (and reliable stretch 1-3 as well
) last year and we can put Guy as stretch 4 if needed.