Colts Cycle Undrafted RB Depth; Castle Arrival Signals Continued Backfield Churn

The Colts signed undrafted running back Anderson Castle and waived Jordon Vaughn on Monday, executing a minor roster shuffle that reveals more about Indianapolis's backfield construction than the names involved suggest. Castle, a four-year Appalachian State contributor who transferred to Duke for the 2025 season, posted modest college production: 488 rushing yards and 12 touchdowns, plus 17 receptions for 111 yards last year. Vaughn, signed as an undrafted free agent earlier in May out of Abilene Christian, lasted less than three weeks on the roster.

The churn itself is the story. Indianapolis has now cycled through multiple developmental backs in a compressed offseason window, signaling either a lack of internal conviction about any single prospect or a pattern of rapid evaluation cycles aimed at finding complementary depth. Neither Castle nor Vaughn carries NFL experience or proven college tape against elite competition—Castle's move to Duke was a lateral step in terms of conference prestige, and neither figures to be a primary ball-carrier for the Colts. The team has not drafted a running back early since 2018, relying instead on the waiver wire and free agency to assemble a depth chart that rotates based on matchup and game script.

For Indianapolis, the calculus is straightforward: undrafted running backs are cheap and replaceable, making the risk-reward of roster spots low-cost. If Castle flashes in practice or preseason, he stays; if not, another UDFA fills the slot. The Colts' offensive identity under the current regime does not require a feature back, and their cap situation does not demand one. The recurring turnover in these late-roster spots is not dysfunction—it is an asset-management strategy, one many modern franchises have adopted as running back scarcity at the top of drafts has intensified.

From a wagering lens, this move has negligible direct impact on Colts player props or team totals. Jonathan Taylor remains the likely primary back, and the team's passing volume will not shift based on Castle's arrival. However, the pattern of undrafted RB cycling does reinforce one operational truth: Indianapolis is unlikely to commit significant offensive script or goal-line opportunities to any back not named Taylor, meaning RB rushing TD props for anyone on this roster outside Taylor remain poor value. The Colts are a pass-first team by design, and their backfield depth chart reflects that reality more than it reflects the quality of any individual backup.