The best teams in the league generally have the best OLines. Good offensive lines feed the running and passing game while also (hopefully) keeping their prized, franchise QBs upright and on the field. You don't have to have the best player at every position. You do want the best five players you can field however with talent and chemistry equal parts in the unit's level of production. Teams that can keep a core unit of linemen together usually reap good benefits from the continuity as the chemistry builds. With COVID-19 impacting the normal NFL offseason preparations only the most talented rookies will be able to contribute at the next level and teams with the most returning players and coaches will have the least issue getting in sync for the season. The fewer moving parts you have, the better off you are. Let's take a look at the NFL offensive line rankings top tier for 2020. It's 3 teams deep. NFL Offensive Line Rankings - Tier 1 Indianapolis Colts What's not to like? The Colts are returning all five of their starter for the 2020 campaign and they are all young and improving. LT Anthony Castonzo, LG Quenton Nelson, OC Ryan Kelly, RG Mark Glowinski, and RT Braden Smith are the epitome of a "unit." Quenton Nelson is arguably the best OG in football (more on that later) with most of his line-mates (all but Glowinski) being top 10 contributors as well. RG Glowinski is the weakest pass-protector of the group but shines at run-blocking which for his position is perfect. With Philip Rivers, they have an upgrade at QB. Time to see how much gas Rivers has left in the tank. He just might get away with his penchant for holding the ball too long with this crew. If not, he will kill this unit's ranking. New Orleans Saints The Saints get back 4 of their 5 starters but have one of the most NFL ready rookies in the draft ready to step in and contribute. LT Terron Armstead and RT Ryan Ramczyk form what is arguably the best OT tandem in the league. Both players are athletic, strong, and consistent. Armstead is uber quick with Ramczyk being more powerful in his playstyle. They perfectly complement each other representing perfect bookends. OC Eric McCoy returns for his sophomore NFL season after a breakout rookie campaign. He will be joined by this year's rookie hopeful, 1st-round pick Cesar Ruiz, who after playing center at Michigan he will be asked to fill Larry Warford's shoes at RG after the team released him this past May. Ruiz reportedly has the pass-blocking skills to get the job done. LG Pete Andrus is the weak link on this line. His last two seasons have been suspect (being polite) and he needs to get back to being the player he was earlier in his career or this will most likely be his last in New Orleans. Dallas Cowboys Dallas has been investing in their offensive line for years and even with the retirement of All-Pro OC Travis Frederick, the 'Boys are deep and talented. LT Tyron Smith used to be the best LT in football. He is still a top-10 talent and fears no man from Dak Prescott's blindside. RG Zack Martin is arguably the best OG in the NFL (see Quenton Nelson above) with the tandem anchoring a talented and deep compliment of teammates. RT La'el Collins had a breakout season in 2019 and only looks to improve. He is the total package and should have the chops to move to LT when\/if Smith retires in a few seasons. After this the talent is there but the pieces are movable. LG is currently Connor Williams with Joe Looney at OC. Both players have Connor McGovern breathing down their necks. Williams and McGovern are talented players who are on the upswing and could easily break out in 2020. Looney played better at OC in his one year of relief for Travis Frederick than Travis himself played in 2019. They are fine at OC and are one player deeper than other squads in the talent department. They have a new offensive line coach and their positions are not set or this crew would be rated higher.