The phrase 'most indicial' can be replaced with several other words and phrases to convey the same meaning. For instance, terms like fundamental, crucial, essential, or pivotal can be used in place of 'most indicial.' You can also use phrases like the most vital or the key to bring out the intended message. Additionally, you can replace the word with words such as significant, principal, important, or central. All these words illustrate the importance of something in a given context. Therefore, selecting synonyms that fit the context in which you are using them is crucial to effectively convey the intended message.