I think it's too early to say he's finished experimenting TBH - he's still got this 6N, and possibly even the summer, though I do feel that anyone who bursts into the reckoning by then would already be tearing it up domestically by this point of the season - priobably or someone who's already been involved in wider squads getting bumped up with form/potential/desperation.
Generally though:
LHP: Genge has graduated from bench against weak opponents to being trusted to start, though probably still 2nd choice behind a fit and available Marler. Rodd seems to be in as 3rd choice if Marler absents himself.
HK: LCD - as with Genge, not a new arrival, but trusted to start. Blamire's probably arrived as 3rd choice, but there's been plenty of experimentation there.
THP: Stuart in for Cole, There have been a few others trialled in as 3rd choice.
LK: Ewels and Hill have been bedded on - though both loos vulnerable, others like Moon and Ribbans have been looked at.
BR: has had plenty of churn, but Dombrandt seems to be being introduced carefully, rather than thrown in willy-nilly. Curry at 8 definitely counts as experimentation, and not as abject a failure as it's often painted here - certainly allows some flexibility for a RWC squad.
SH: Quirke, Mitchell & Randall
FH: Smith
& Furbank
CE: Marchant, Lawrence, Atkinson
WG: Radwan, Malins, Lynah
FB: Steward, Furbank, Freeman
Now his first choice XV may not be particularly different, but then we sent a very young squad to Japan; most of the changes will be players who's risen from 2nd/3rd choice up to starter - which is as it should be TBH. His 33-man RWC squad will have a fair few new faces from 2019; his wider 45ish-man training / standby squad will have even more.
Given the same head coach, how much churn does anyone expect in 1st choice 23s between RWCs? You'd expect evolution > revolution, surely? certainly compared to an interval with a new head coach, or following a disastrous RWC.
Not all experiments succeed; and some are more throwing a body in in desperation, whilst protecting your actual project players.
I'd suggest the likes up Rodd, Dombrandt, Quirke, Smith, & Steward are being fed in carefully, with differing time frames and responsibilities based on Eddie's assessement of them as individuals; whilst others like Blamire, Dunn, Ewels, Mitchell, Furbank have been thrown in a bit partially because someone needs to wear that shirt this week, and partly to see if they pleasantly surprise Eddie.
