staying healthy is a prerequisite for any team to be successful, not just the lions. i would also add that i'm still concerned about goff's limitations and the other team's ability to exploit them (see the pats and cowboys games last year). a really good running game should help there, but expecting him to go 17-0 td/int ratio like he did in the second half of the season is unrealistic.
other concerns would be a lack of a proven deep threat at receiver. i know everyone loves the potential of jaymo, but he hasnt done anything yet. the league hasnt had a chance to see what he cant do (other than follow the league's gambling rules). they're a team without star players on defense and still have a hole at run stuffing DT, imo.
with that said, EVERY team has holes. the lions are well positioned to win a division that appears weak on paper. 10 wins should be the only acceptable outcome barring injuries. 11-12 is possible too.
heck, the viqueens won 13 games last year and they sucked.