As Memorial Day approaches, the MLB trade rumor season is beginning to take shape, giving fans insights into the notable narratives that may unfold leading up to the July 31 trading deadline. In anticipation of potential moves, Moneyline introduces a BS Meter, set on four levels: non-existent, low, medium, and high. The purpose of this meter is to assess the credibility of reported trade rumors without questioning the integrity of the journalists involved.

A recent report from MLB.com's Mark Feinsand indicated that the Philadelphia Phillies reached out to veteran reliever David Robertson before José Alvarado's performance-enhancing drug suspension was made public. Feinsand clarified that no serious negotiations took place, placing the BS Meter for this rumor at a low level. The Phillies may require bullpen reinforcements, especially after losing Alvarado, which makes the inquiry into Robertson reasonable. However, considering that Robertson remains a free agent despite an effective season last year, questions arise regarding his current status. At 40 years old, it is uncertain whether he is seeking a specific contract or contemplating retirement, but it appears that he will pitch again this season, although the timing and team remain undetermined.

In another rumor, Bob Nightengale of USA Today reported that the Los Angeles Dodgers and Chicago Cubs are closely monitoring Ryan McMahon of the Colorado Rockies, in case a trade opportunity arises. This rumor carries a high rating on the BS Meter due to the Rockies' organizational tendencies, which historically lean toward retaining key players even during tough seasons. McMahon, despite his past All-Star status, is hitting only .211 this season with a .706 OPS. For teams in need of third base help, acquiring McMahon may present a dilemma, especially considering his financial commitment of $32 million between 2026 and 2027. The Rockies could facilitate a trade if they were to absorb some of his salary or accept a lesser prospect return, but they might opt to keep him as one of the few remaining high-profile names on their roster. The Dodgers' interest in McMahon could be contingent on Max Muncy's performance, which has been sluggish.

Furthermore, Jon Heyman indicated in a recent stream that the likelihood of the Pittsburgh Pirates trading Paul Skenes this summer is non-existent. Skenes, at just 22 years old and with a promising 2.12 ERA over his initial 33 MLB starts, is not a trade candidate for the rebuilding Pirates. Despite the challenges the team has faced, Skenes is viewed as a cornerstone for the future, and trading away such talent early in his career would be ill-advised. While concerns linger regarding ownership reluctance to invest, the Pirates need to focus on building around their emerging stars rather than parting with them.

Another opinion from Nightengale suggested that Rhys Hoskins could be an ideal fit for the Boston Red Sox if the Milwaukee Brewers decide to sell. While this aligns with the notion that Hoskins' power-hitting style could thrive at Fenway Park, the Brewers' current standing at 24-26 may deter them from surrendering key players. The Brewers have shown a willingness to trade veterans when necessary, as seen in their previous dealings. Hoskins, returning from a torn ACL, is demonstrating significant improvement with a .902 OPS this season, possibly making him an attractive option in the trade market. Should the Brewers decide to part with him, they could seek both prospect returns and alleviate their obligation to his contract's buyout clause.

Lastly, in a discussion about Luis Robert Jr., Jon Heyman remarked that a trade would be unlikely if his performance continues to falter, considering he is currently batting under .200. Robert was once regarded as a cost-effective asset for the Chicago White Sox, but his recent struggles and history of injuries raise red flags for potential trade suitors. While he still possesses speed and defensively valuable skills, doubts about his long-term fit and contract options would deter teams from parting with top prospects at this juncture.