Which positions do you feel are set? Which need to be upgraded?

In this thread we're only considering the starters, not the depth.Taking a look at the starters on the depth chart as it would look if everyone were healthy and re-signed for 2016, which positions do you feel are set well enough at starter? Which starters need to be upgraded? Finally, how would you fix these holes in the starting lineup?WR Vincent JacksonLT Donovan SmithLG Logan Mankins C Joe HawleyRG Ali Marpet RT Gosder CherilusTE Austin Seferian-JenkinsWR Mike EvansQB Jameis WinstonRB Doug MartinFB Jorvorskie LaneLDE William GholstonDT Gerald McCoyDT Akeem SpenceRDE Jacquies SmithSLB Danny LansanahMLB Kwon AlexanderWLB Lavonte DavidCB Sterling MooreCB Jude Adjei-BarimahSS Chris ConteFS Bradley McDougald