​One game.Then Dan Campbell and Brad Holmes have to start making phone calls nobody wants to make.The Detroit Lions close the preseason Saturday against the Indianapolis Colts, and less than 24 hours later, the roster has to be down to 53 players. The NFL’s official calendar sets the deadline for 6 p.m. ET Sunday, while also allowing teams to designate up to two players placed on reserve lists during cutdown for a future return. NFL roster cutdown rulesMost of Detroit’s roster is already decided.The last six or seven spots are where things get ugly.Saturday still represents one final audition for the Lions’ roster bubble, particularly at backup quarterback, receiver, defensive line and nickel.Here is my latest prediction.Quarterback — 2Jared GoffJosh DobbsCut: Luke AltmyerThis is one of the toughest calls on the roster.Altmyer has done enough this summer to turn what once looked like a developmental season into a legitimate battle with Dobbs for the QB2 job.I’m still going with Dobbs.Detroit has Super Bowl aspirations, and experience matters when you’re talking about the player who would have to replace Goff without warning.Could Altmyer change my mind Saturday?Absolutely.Prediction: Goff, DobbsRunning Back — 4Jahmyr GibbsIsiah PachecoSione VakiJacob SaylorsThis group feels relatively straightforward.Gibbs and Pacheco are obvious. Vaki’s special-teams value keeps him safe.Saylors has done the rest himself, leading Detroit with 87 rushing yards on 14 preseason carries entering Saturday.The recent back injury to Pacheco only strengthens the case for keeping four.Prediction: Gibbs, Pacheco, Vaki, SaylorsWide Receiver — 5Amon-Ra St. BrownJameson WilliamsIsaac TeSlaaGreg DortchTay MartinTough cut: Dominic LovettMartin might be one of the best stories of Detroit’s camp.He entered the summer surrounded by receivers fighting for scraps behind St. Brown, Williams and TeSlaa. He leaves it with a legitimate chance to make the team.Martin’s combination of offensive improvement and special-teams work has helped him separate himself in the WR5 race.Dortch’s return ability gives him an important role.I’m stopping at five.Prediction: St. Brown, Williams, TeSlaa, Dortch, MartinTight End — 3Sam LaPortaBrock WrightTyler ConklinTough cut: Jackson MeeksThis one hurts.Meeks has done just about everything a bubble player can do. He has shown receiving ability, embraced the conversion to tight end and contributed on special teams.I just can’t find the chair.Keeping Meeks means stealing a spot from somewhere else, and Detroit has too many needs in the secondary and along the offensive line to justify TE4.That does not mean Meeks isn’t good enough.Sometimes roster math wins.Prediction: LaPorta, Wright, ConklinOffensive Line — 9Penei SewellChristian MahoganyJuice ScruggsTate RatledgeBlake MillerLarry BoromMiles FrazierBen BartchSeth McLaughlinIR/designated for return: Cade MaysDetroit’s projected starting five appears settled: Sewell, Mah