Yes, they are focusing on defensive role players.
But they have already added quite a bit of offensive firepower (Bargnani, Hardaway, Leslie, and a potentially healthier Amar'e), as well as potentially Bobby Brown.
Also, actually, bigs such as Earl Barron, Jerome Jordan, Eloy Vargas, and Jeremy Tyler who they have also been giving looks to also have more offensive game than either Chandler or Martin do, not that any of them are big time offensive players.
However, I think that you do not necessarily need to add players who average 19 pts a game to this team, so long as you have enough players who can give you 20 pts on a given night, against a particular matchup.
Would I prefer all star two-way players? Of course, but get real.