With Williams now locked in, how should dynasty managers react? Here's one buy, one sell, and one deep stash following his new deal in Dallas.

Buy: RB Javonte Williams, DAL

Williams was once a dynasty cornerstone after bursting onto the scene in 2021. Injuries and inconsistent play stalled that momentum, and the Denver Broncos let him walk last offseason. He responded with the best season of his career in Dallas and now has long-term security.

Williams finished as the RB12 last season, scoring 11 rushing touchdowns on 252 carries (10th-most in the league). There's still room for growth. With the Cowboys' offensive line under contract and expected to be healthy entering 2026, both volume and efficiency could tick up. Williams averaged 4.77 yards per carry and has a realistic chance to match or exceed that mark.

There's lingering skepticism about whether Williams can be the guy in an offense, but he answered many of those questions last year. He profiles as a high-end RB2 for dynasty purposes, yet may still be priced closer to a low-end RB2. If possible, let the initial extension hype cool before making your move.

Williams is still just 25 years old. While injuries cost him time, they also reduced long-term wear and tear. He's positioned to be the focal point of Dallas' offense over the next three seasons and could still command another contract at age 28. That combination of production, age, and security makes him a strong buy.

Sell: RB Isiah Pacheco, FA

This comes down to supply and demand.

Entering free agency, only a handful of teams were realistically seeking a lead back: Cowboys, Jets, Saints, Chiefs, Texans, Seahawks, and Commanders. You could argue for a few others, but true starting openings were limited. Meanwhile, the supply side is deep -- both in free agency and the NFL Draft -- with as many as 10–12 backs capable of pushing for starting roles.

Williams signing in Dallas removes one premium opportunity from the board. Eventually, someone gets squeezed out. My bet is on Isiah Pacheco.

Pacheco has battled injuries throughout his four-year career and hasn't played a full season since his rookie year. At 26, he'll likely seek a multi-year deal similar to Williams'. He may find one, but it's hard to envision him landing a true three-down role.

He's limited as a pass catcher, which caps his fantasy ceiling. At 5'10”, 216 pounds, he's not a prototypical goal-line hammer, and he's averaged under 4.0 yards per carry over the past two seasons. His efficiency metrics -- including yards after contact and broken tackles -- don't suggest a player teams will prioritize as a feature back.

Right now, you might be able to move Pacheco for a late second-round rookie pick. In a month, that could drop significantly if he lands in a committee or misses out on a strong opportunity altogether. Dynasty managers should be proactive before the market corrects.

Deep Stash: RB Phil Mafah, DAL

We don't yet know the full cap implications of Williams' extension, but Dallas entered the offseason tight against the cap. Even if the deal is structured favorably, they'll need to be selective with additional spending.

Veteran depth options may be added cheaply, but the backup role behind Williams is wide open. That makes Phil Mafah an intriguing stash.

Mafah (6'0”, 234 lbs) has a similar build and downhill running style to Williams (5'10”, 220 lbs). By contrast, Jaydon Blue is smaller at 5'9”, 196 lbs and profiles more as a change-of-pace option.

Neither Mafah nor Blue projects as a major factor in the passing game, but Mafah's size makes him a logical direct backup and potential goal-line option if Williams misses time. He's entering his second year and may still be on taxi squads in many dynasty leagues, making him inexpensive to acquire.

If you roster Williams, Mafah is a sensible handcuff. Even if you don't, he's the type of low-cost depth stash who could gain significant value with one injury or depth chart shift.

Williams' extension clarifies the Dallas backfield and stabilizes one dynasty asset, but it tightens the market elsewhere. Act accordingly -- buy stability, sell uncertainty, and stash upside where it's cheap.