IMO if Noteboom has a good season like I would anticipate, that would make Jackson the heir apparent to Havenstein. Zach Thomas can play swing OT though I think he would be a better OG. If Warren McClendon can work on his footwork he could also be in play for RT. His slow feet is IMO his biggest weakness. Footwork can be improved, if Wendell thinks he can fill the bill. Personally I think Jackson would be the Ram's best option at RT. If Noteboom struggles which I think would be unlikely, then Jackson would be their best option at LT.
On passing downs Allen becomes their best option at TE. He can give Havenstein a chip assist before getting out into his pattern. That is Higbee's biggest issue IMO. He either can't or won't give a chip assist to slow the speed rushers down on the right. Davis Allen could become the new starting TE in 2024 and TE2 this year, because of his willingness to block. Having a starting TE who can block also puts McClendon in play at RT if Bruss struggles and Jackson starts at RG.