San Francisco 49ers training camp has seen the absence of star wide receiver Brandon Aiyuk and All-Pro left tackle Trent Williams, with Williams' absence confirmed by Coach Kyle Shanahan as contract-related. Aiyuk, who reported to camp amidst trade request rumors, is under contract through the season but has not engaged in practice, potentially indicating a hold-in situation while seeking a new deal. The 49ers' general manager, John Lynch, stated they intend to keep Aiyuk but are open to listening to trade offers, highlighting the team's financial constraints with multiple high-value contracts. Meanwhile, rookie tight end Cameron Latu has returned to training camp without injury concerns, competing for a spot behind George Kittle and Logan Thomas. Aiyuk's performance last season was notable, leading the team in receiving yards and touchdowns, making his situation critical for both him and the 49ers' Super Bowl aspirations. The organization faces a delicate balance between retaining key players and managing their salary cap effectively.