Worth slotting in?

[SauberF1]

12 Team H2H, non-keeper with 10 stats (R, HR, RBI, SB, AVG, W, SV, K, ERA, WHIP)
Currently 1st in the league but that's because of my batting. I'm hit or miss on the pitching side of things. I've noticed some pitchers starting to improve and was wondering if they are worth swapping into my roster?

On my watch list includes:
J. Howell (RP)
C. Wilson (RP) - I know he is the closer recently because of Francisco's injury. Worth looking into?
S. Baker (SP)
C. Kershaw (SP) - been picking him up (for home games) and dropping him for potential RPs during the rest of the week (no max on moves)
R. Porcello (SP)
R. Bannister (SP)

Pitchers
SP - J. Lackey (SP)
SP - C. Lee (SP)
RP - M. Lindstrom (RP)
RP - D. Aardsma (RP)
P - R. Madson (RP)
P - E. Jackson (SP)
P - J. Weaver (SP)
BN - Z. Duke (SP)
BN - T. Hanson (SP)
DL - E. Volquez (SP)

Batters
C - J. Mauer (C)
1B - A. Pujols (1B)
2B - C. Figgins (2B, 3B)
3B - P. Sandoval (C, 1B, 3B)
SS - C. Barmes (2B, 3B, SS)
OF - J. Bay (OF)
OF - J. Werth (OF)
OF - C. Crawford (OF)
Util - C. Beltran (OF)
BN - A. Soriano (OF)
BN - A. Beltre (3B)
BN - A. Callapso (2B, SS)