I guess I would go
player/ position peak OPS+/ERA+ WAR peak SB
SP
Randy Johnson peak 197ERA+ 10.7 WAR
Closer
Diaz peak 234 ERA+ 3.2 WAR
1 Ichiro RF 130 9.2 56
2. ARod SS 176 10.4 46
3. Griffey CF 171 8.2 24
4. Edgar 3B 185 7.0* 14
5. Nelson Cruz DH 159 5.1 20
6. Boone 2B 153 8.8 16
7 Alvin Davis 1B 156 6 5
8. Mitch Haniger LF 138 6.1 8
9. Omar Narvaez C 132 3*
Strongle considered: DH Vogelbach, Beltre 3B Prime years were not as a mariner, Jon Olerud WSU local connection but traded for vs kinda of signed or drafted, Mike Cameron ~ LF Cf range Defense peak 120's OPS and 30 SB, Zunino C 125 OPS season, Dan Wilson C,
*Note if he had his peak hitting season while he was still playing above average 3B he would have a lot more WAR
*2 OPS+ and WAR this years prorated full season
Vs the Yankees
C Yogi Bera 125 OPS+ peak 141 5 SB 6.3 peak WAR
1B Lou Gehrig 179 OPS+ 17 SB 220 peak

11.8
2B Robinson Cano 126 OPS+ 10 SB 147 OPS+ peak 8.1
3B AROD can't playt for 2 teams
SS Jeter 115 OPS+ career peak 153 OPS+ 8 WAR
Outfield
Babe Ruth 206 OPS+ career peak 14.3 WAR 255 OPS+
Joe Dimaggio 155OPS+ peak 184 9.1
Mickey Mantle 172 OPS+ peak 221OPS+ 11.3
3B Red Rolfe 99 OPS+ 23.5 career WAR peak 130 OPS+ 5.9 WAR
Nope not Alex this is a problem position for the Yankees I looked up best yankee 3B and 4 of the 5 Alex, Craig Nettles, Wade Boggs, Scott Broscius were all guys that established themselves elsewhere.
SP
Whitey Ford 133 ERA+ career peak 177 ERA+ 6.7 WAR
Closer
Mariano Rivera Peak 318 ERA+ 4.3 WAR
Overall Yankees>Mariners but if you don't let the Yankees have Alex at 3rd it gets a lot closer than many would think
Randy>Ford
]Diaz<Mo Rivera
Narvaez < Yogi Bera
Davis < Lou Gehrig
Boone > Cano*
AROD > Jeter
Edgar > Rolfe
Griffey<Ruth
Ichiro< Mantle
Haniger<Joe Dimaggio
*Technically Boone's very best season beats Robbie's but obviously Cano is far better. But given peak seasons M's win Randy vs Whitey SP, 2B Cano vs Boone, Arod over Jeter, and Edgar over Rolfe. No seperate DH. The 117 seasons of Yankee history compared to the 43 seasons of Mariner history. Some of those Lou Gehrig Babe Ruth numbers are too far out there for a modern player to live up to. Barry Bonds roided version 2.0 not withstanding.