Shaw will presumably start at third base against righties, with Jonathan Villar starting at second base, leaving Gennett with nowhere to play against righties, which is the only time he would be in the lineup in the first place. The Brewers would like to move Gennett if a buyer emerges, but there is not much demand for a second baseman who needs a platoon partner and is a below-average defender. For now it looks like he will enter 2017 as a weapon off the bench against right-handed pitching.
Spangenberg has progressed well from the torn quad that he suffered in mid-July. He has elected to forego winter ball, but will be ready for the start of spring training. The 2011 first-round pick will likely open the year as a utility bench bat for the Padres, but is worth keeping an eye on as he possess the speed to make a fantasy impact if he is able to work his way into a regular role.
Harrison injured his groin on Sept. 11 and did not appear in another game for the Pirates. It appears that he has progressed well and will be fully healthy for the start of spring training. It is not a guarantee that he will open the season with the Pirates, as it is rumored that the team is open to trading the second baseman whose offensive production has tapered off since his breakout 2014 campaign.
Pirela was one of six players cut loose by San Diego. The 27-year-old went 6-for-39 with two extra-base hits and a 1:9 BB:K in the majors last year and the results at Triple-A El Paso were less than stellar. He hasn't played shortstop over the past couple years and appears destined to continue on as a fringe major leaguer in 2017.
Amarista provided versatility off the Padres' bench, making starts at five different positions last season. He makes decent contact but has never been an offensive threat (career .230/.276/.320), and there's a chance he could find himself back in the minors to begin 2017.
Gennett will receive a nice raise (from $518,100 in 2016) in his first year of arbitration eligibility. He put up his typical, serviceable numbers against righties in 2016, and while he was better against lefties, he will likely be strictly platooned again in 2017. That should keep him off the mixed-league radar for most.
He returns to the team that drafted him in the third round of the 2010 draft after washing out of the Angels' and Red Sox's systems in recent years. Look for him to offer organizational infield depth for a team that has entrenched everyday options at second base, shortstop and third base heading into 2017.
The move protects Leyba from being taken in the Rule 5 draft, which was likely required after a season in which Leyba hit .296/.355/.429 between high-A Visalia and Double-A Mobile. Leyba's numbers actually improved after he was promoted to Mobile, so he could see some time in the majors if he shows the same progression in 2017.
Alvarez hasn't advanced past the Low-A level but with five professional seasons now under his belt, he had to be added to the 40-man or else exposed to the Rule 5 draft. The 22-year-old hit .323/.404/.476 from the left side with Peoria in 2016, adding 36 steals in 51 attempts.
Valentin put together a strong 2016 campaign split between Double-A and Triple-A. His numbers tapered off a bit upon the promotion and his strikeouts rose, though, and given the other higher-profile prospects the Phillies have coming up, it'll be tough for Valentin to carve out a big role going forward.