Mustapha will compete for playing time in the 49ers' secondary as an instinctual split-field safety with a strong tackling ability, fitting well with the team's physical defense.
Under new defensive coordinator Nick Sorenson, Mustapha's skills make him versatile in various coverage schemes and position responsibilities.
Mustapha demonstrated his on-field production in college, with stats indicating his potential impact in both defense and special teams in the NFL.
ESPN's Matt Bowen highlighted Mustapha as a rookie with the potential to contribute immediately on special teams, showcasing his readiness for the professional level.