Front row: (Tight Head) We know what Sinckler can do, especially his exciting loose play, interested to see if Stuart or Williams for example can show the merits of an uber big, solid scrummaging tight head.
Hooker - not much to say, seems to be going nicely
(Loose Head) Mako when available is one of our most important carriers, Marler offers a great scrummaging back up but may not be playing at test level for much longer - for me jury's very much still out on Genge and remain to be convinced.
Second row: For me Launchbury and Itoje may be the strongest combo we've got - Launch is the closest lock we've got to Simon Shaw in terms of physical prescence, ballast and mauling ability - by contrast Itoje (who is on the smaller side for locks at 6'5") does provide immense athleticism in line out, as well as some great fetching and defence - do feel that if he could work on his carrying position he could be even better.
Lawes isn't the biggest in terms of scrummaging ballast but his defence and carrying are great, as an impact player. For me Kruis has always come over as a bit stodgy and limited in talent compared to the other three aforementioned - but when coupled with Itoje they do seem to be greater than the sum of their individual parts.
(Would like to see some new giant locks emerge from club/academy to add some ballast but as has been said often there don't seem to be many of any on the horizon)
Back row (hooray!

The fact both Willis and Ludlum in particular play open side at their clubs is a strength (in the same way it was for Richard Hill) and enables them to cover the 7 berth if required.
At openside: I think so long as he can fend off injuries Underhill will be Eddie and Lions' first choice pick - primarily for his x-factor defence (he's a kind of millennial Winterbottom

At No.8:Eddie will pick Billy every time he can - my argument is a good opportunity has been lost to try out Dombrandt in the 6 Nations.