IfnotforinjuriessideliningtheBills'twotopquarterbacks,rookieEJManuel(leftknee)andveteranKevinKolb(concussion),Leinartmightstillhavebeenwaitingbythephone.Instead,aftersigningwithBuffaloonSunday,Leinartwillhavewhat'sessentiallyaone-timetryouttocompeteforabackupspotastheBills(2-1)closethepreseasonagainstDetroit(2-1)Thursday.TuelisexpectedtogetlimitedplayingtimebecausetheBillsarewaryofhavingyetanotherquarterbackhurtbeforeopeningagainstNewEnglandonSept.8.