diff --git a/lib/permissions/minimally-encoded-thread-permissions-validators.js b/lib/permissions/minimally-encoded-thread-permissions-validators.js
--- a/lib/permissions/minimally-encoded-thread-permissions-validators.js
+++ b/lib/permissions/minimally-encoded-thread-permissions-validators.js
@@ -13,7 +13,6 @@
   MinimallyEncodedRoleInfo,
   MinimallyEncodedThreadCurrentUserInfo,
   RawThreadInfo,
-  ResolvedThreadInfo,
   ThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
 import { threadTypeValidator } from '../types/thread-types-enum.js';
@@ -77,12 +76,6 @@
     pinnedCount: t.maybe(t.Number),
   });
 
-const resolvedThreadInfoValidator: TInterface<ResolvedThreadInfo> =
-  tShape<ResolvedThreadInfo>({
-    ...minimallyEncodedThreadInfoValidator.meta.props,
-    uiName: t.String,
-  });
-
 const minimallyEncodedRawThreadInfoValidator: TInterface<RawThreadInfo> =
   tShape<RawThreadInfo>({
     ...legacyRawThreadInfoValidator.meta.props,
@@ -105,6 +98,5 @@
   minimallyEncodedMemberInfoValidator,
   minimallyEncodedRelativeMemberInfoValidator,
   minimallyEncodedThreadInfoValidator,
-  resolvedThreadInfoValidator,
   minimallyEncodedRawThreadInfoValidator,
 };
diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -1027,15 +1027,6 @@
     'Only visible to its members and admins of ancestor channels.',
 };
 
-function memberIsAdmin(
-  memberInfo: RelativeMemberInfo | MemberInfo,
-  threadInfo: RawThreadInfo | ThreadInfo,
-): boolean {
-  return !!(
-    memberInfo.role && roleIsAdminRole(threadInfo.roles[memberInfo.role])
-  );
-}
-
 // Since we don't have access to all of the ancestor ThreadInfos, we approximate
 // "parent admin" as anybody with CHANGE_ROLE permissions.
 function memberHasAdminPowers(
@@ -1808,7 +1799,6 @@
   threadUIName,
   threadInfoFromRawThreadInfo,
   threadTypeDescriptions,
-  memberIsAdmin,
   memberHasAdminPowers,
   roleIsAdminRole,
   threadHasAdminRole,
diff --git a/lib/types/minimally-encoded-thread-permissions-types.js b/lib/types/minimally-encoded-thread-permissions-types.js
--- a/lib/types/minimally-encoded-thread-permissions-types.js
+++ b/lib/types/minimally-encoded-thread-permissions-types.js
@@ -8,7 +8,6 @@
 import type {
   LegacyMemberInfo,
   LegacyRawThreadInfo,
-  LegacyRelativeMemberInfo,
   LegacyRoleInfo,
   ThreadCurrentUserInfo,
 } from './thread-types.js';
@@ -122,32 +121,6 @@
   +isViewer: boolean,
 }>;
 
-const minimallyEncodeRelativeMemberInfo = (
-  relativeMemberInfo: LegacyRelativeMemberInfo,
-): MinimallyEncodedRelativeMemberInfo => {
-  invariant(
-    !('minimallyEncoded' in relativeMemberInfo),
-    'relativeMemberInfo is already minimally encoded.',
-  );
-  return {
-    ...relativeMemberInfo,
-    minimallyEncoded: true,
-    permissions: permissionsToBitmaskHex(relativeMemberInfo.permissions),
-  };
-};
-
-const decodeMinimallyEncodedRelativeMemberInfo = (
-  minimallyEncodedRelativeMemberInfo: MinimallyEncodedRelativeMemberInfo,
-): LegacyRelativeMemberInfo => {
-  const { minimallyEncoded, ...rest } = minimallyEncodedRelativeMemberInfo;
-  return {
-    ...rest,
-    permissions: threadPermissionsFromBitmaskHex(
-      minimallyEncodedRelativeMemberInfo.permissions,
-    ),
-  };
-};
-
 export type RawThreadInfo = $ReadOnly<{
   ...LegacyRawThreadInfo,
   +minimallyEncoded: true,
@@ -221,6 +194,4 @@
   decodeMinimallyEncodedMemberInfo,
   minimallyEncodeRawThreadInfo,
   decodeMinimallyEncodedRawThreadInfo,
-  minimallyEncodeRelativeMemberInfo,
-  decodeMinimallyEncodedRelativeMemberInfo,
 };