The difference with Crabtree, taken by the 49ers with the 10th pick in April's draft, is, according to online reports, that agent Eugene Parker is believed to be looking for top-five money for his client based on the perception of where the Texas Tech wide receiver was expected to be taken.
Perception met reality April 25, when Crabtree lasted until No. 10.
The draft's top five were quarterback Matthew Stafford (Lions), tackle Jason Smith (Rams), defensive lineman Tyson Jackson (Chiefs), linebacker Aaron Curry (Seahawks) and quarterback Mark Sanchez (Jets).
After Sanchez went tackle Andre Smith (Bengals), wide receiver Darrius Heyward-Bey (Raiders), tackle Eugene Monroe (Jaguars), defensive tackle B.J. Raji (Packers) and Crabtree.
Since Crabtree wasn't even the first receiver taken in the draft, Parker might have trouble getting top-five money from the 49ers, if that is his intent. Parker did not return phone calls and e-mails from The Chronicle seeking comment on his contract negotiations with the 49ers.
Crabtree, as it turns out, is the linchpin of the entire first round.
Only four of the 32 first-round picks have signed, as of Tuesday - Stafford at No. 1, Sanchez at No. 5, center Alex Mack at No. 21 and Ziggy Hood at No. 32 - and Parker's fellow agents are waiting to see what his guy gets before crunching numbers on behalf of their own clients.
NFL rookie contracts are normally slotted according to where a player was drafted.
"As a coach, I think every situation is different," Singletary said. "I don't know his agent. I do know we have been fair. We're hopeful of getting it done. In time it will work itself out."