Rumored Mariner signing Nelson Cruz would add a powerful bat to a lineup already bolstered by the arrivals of Robinson Cano and Corey Hart. What signing Cruz doesn’t do is guarantee success.

An offensive triumvirate of Cruz, Cano and Kyle Seager isn’t one to balk at, and is a wonderful foundation for the team moving forward, but in terms of success, it guarantees nothing.

In most divisions, like say the NL West, these kinds of additions (Cano, Cruz, Hart) would push a team towards the top of the table. Not so much with the Mariners in the AL West.

The rest of the division is stocked. The Mariners’ rise to “playoff-contender” status, if not the realm of respectability, has vaulted the division to a ridiculous level. On paper, the Angels, A’s and Rangers all have the talent to be playoff teams. Throw in Seattle, and you end up with a lot of unhappy teams come the postseason.

It wouldn’t be completely surprising to see, even with Cano and friends, the M’s finish in the same exact place in the standings as last year. They’re probably going to have an improved record, but as stated, the division is stacked.

If one thing is clear after watching postseason baseball, it’s that pitching is needed to contend. Teams like Detroit, Boston, St. Louis and Oakland found great success last year with tremendous staffs. And it wasn’t just those four teams; most playoff teams boasted strong pitching. Great pitching is nearly synonymous with a playoff squad now-a-days.

Which brings the topic of one-way conversation in the piece to the Mariners’ pitching.

The M’s will use some combination of Erasmo Ramirez, Taijuan Walker, James Paxton, Brandon Maurer and recent signing Scott Baker for the last three spots in the rotation. This is where question marks come into play. Moving into the future, both Walker and Paxton figure to be mainstays in the Seattle rotation thanks to their fantastic potential, but between them they have a grand total of 39 innings at the big league level. Whether they continue to show promise or hit a wall remains to be seen.

Ramirez and Maurer have both shown flashes of potential in the past, but the jury remains largely out on the pair. It wouldn’t be surprising to see Baker, given his experience and quality, leapfrog one or both of them to claim a rotation spot. The bottom line is that the Mariners’ rotation could show the promise and poise that Oakland’s young hurlers have shown, or they could continue to display the growing pains that have plagued the team.

If anything, a potential Cruz signing puts more pressure on the rotation to succeed. The one-time Brewer coupled with Cano, Hart and Logan Morrison would vastly improve a team that had issues scoring runs. The run output in Seattle should, at the very least, be slightly above average. The Mariners need their young pitchers to step up. If they can do this, Seattle will be in a position to contend. If not, well let’s just say get ready for all those low-scoring losses to turn into higher-scoring losses.